Merge remote-tracking branch 'origin/master' into newmaxmin
Conflicts: TODO
This commit is contained in:
John Cupitt
commit
7a202cf95e
@ -22,6 +22,8 @@
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- vipsthumbnail -o allows absolute file names
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- much better exif handling for jpg images (thanks Gary)
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- preserve jpeg app13 (photoshop ipct)
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- nearest neighbour goes back to round down ... round to nearest caused a
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range of annoying problems, such as strange half-pixels along edges
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14/11/12 started 7.30.6
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- capture tiff warnings earlier
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8
TODO
8
TODO
@ -1,3 +1,11 @@
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- now we've removed round-to-nearest from NN, we need something extra in the
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affine transform to displace the input cods
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dx/dy displace output
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- check Nicolas's follow-up mail
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- check libtool version number, should be binary-compat with 7.30
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- quadratic doesn't work for order 3
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@ -4,7 +4,6 @@ libcolour_la_SOURCES = \
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colour.c \
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colour.h \
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colourspace.c \
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colour_dispatch.c \
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dE76.c \
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dE00.c \
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dECMC.c \
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@ -45,6 +45,195 @@
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#include "colour.h"
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/**
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* SECTION: colour
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* @short_description: colour operators
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* @stability: Stable
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* @see_also: <link linkend="libvips-arithmetic">arithmetic</link>
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* @include: vips/vips.h
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*
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* These operators let you transform coordinates and images between colour
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* spaces, calculate colour differences, and move
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* to and from device spaces.
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*
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* Radiance images have four 8-bits bands and store 8 bits of R, G and B and
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* another 8 bits of exponent, common to all channels. They are widely used in
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* the HDR imaging community.
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*
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*
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* The colour functions can be divided into three main groups. First,
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* functions to transform images between the different colour spaces supported
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* by VIPS: <emphasis>RGB</emphasis>, <emphasis>sRGB</emphasis>,
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* <emphasis>XYZ</emphasis>, <emphasis>Yxy</emphasis>,
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* <emphasis>Lab</emphasis>, <emphasis>LabQ</emphasis>,
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* <emphasis>LabS</emphasis>, <emphasis>LCh</emphasis> and
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* <emphasis>CMC</emphasis>). Use vips_colourspace() to move an image to a
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* target colourspace using the best sequence of colour transform operations.
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* Secondly, there are a set of operations for
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* calculating colour difference metrics. Finally, VIPS wraps LittleCMS and
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* uses it to provide a set of operations for reading and writing images with
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* ICC profiles.
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*
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* This figure shows how the VIPS colour spaces interconvert:
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*
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* <inlinegraphic fileref="interconvert.png" format="PNG" />
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*
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* The colour spaces supported by VIPS are:
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*
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* <itemizedlist>
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* <listitem>
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* <para>
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* <emphasis><code>LabQ</code></emphasis>
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*
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* This is the principal VIPS colorimetric storage format.
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* LabQ images have four 8-bit bands and store 10 bits of L and 11 bits
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* of a and b.
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*
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* You cannot perform calculations on <code>LabQ</code> images (they are
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* tagged with %VIPS_CODING_LABQ), though a few operations such as
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* vips_extract_area() will work directly with them.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* <emphasis><code>LabS</code></emphasis>
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*
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* This format represents coordinates in CIELAB space as a
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* three-band #VIPS_FORMAT_SHORT image, scaled to fit the full range of
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* bits. It is the best format for computation, being relatively
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* compact, quick, and accurate. Colour values expressed in this way
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* are hard to visualise.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* <emphasis><code>Lab</code></emphasis>
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*
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* Lab colourspace represents CIELAB colour values with a three-band
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* #VIPS_FORMAT_FLOAT image. This is the simplest format for general
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* work: adding the constant 50 to the L channel, for example, has the
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* expected result.
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*
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* VIPS uses D65 LAB, but you can use other colour temperatures with a
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* little effort, see vips_XYZ2Lab().
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* <emphasis><code>XYZ</code></emphasis>
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*
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* CIE XYZ colour space represented as a three-band #VIPS_FORMAT_FLOAT
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* image.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* <emphasis><code>Yxy</code></emphasis>
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*
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* CIE Yxy colour space represented as a three-band #VIPS_FORMAT_FLOAT
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* image.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* <emphasis><code>RGB</code> / <code>sRGB</code></emphasis>
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*
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* VIPS converts XYZ to and from sRGB using the usual formula:
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*
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* http://en.wikipedia.org/wiki/SRGB
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*
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* You can also use vips_icc_transform() and friends to go to and from
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* device space with a generic profile.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* <emphasis><code>LCh</code></emphasis>
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*
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* Like <code>Lab</code>, but rectangular <code>ab</code> coordinates
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* are replaced with
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* polar <code>Ch</code> (Chroma and hue) coordinates.
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* Hue angles are expressed in degrees.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* <emphasis><code>CMC</code></emphasis>
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*
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* A colour space based on the CMC(1:1) colour difference measurement.
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* This is a highly uniform colour space, much better than CIELAB for
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* expressing small differences.
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*
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* You can calculate metrics like CMC(2:1) by scaling the spaces before
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* finding differences.
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* </para>
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* </listitem>
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* </itemizedlist>
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*/
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/* Areas under curves for Dxx. 2 degree observer.
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*/
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/**
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* VIPS_D93_X0:
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*
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* Areas under curves for D93, 2 degree observer.
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*/
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/**
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* VIPS_D75_X0:
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*
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* Areas under curves for D75, 2 degree observer.
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*/
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/**
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* VIPS_D65_X0:
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*
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* Areas under curves for D65, 2 degree observer.
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*/
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/**
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* VIPS_D55_X0:
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*
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* Areas under curves for D55, 2 degree observer.
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*/
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/**
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* VIPS_D50_X0:
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*
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* Areas under curves for D50, 2 degree observer.
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*/
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/**
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* VIPS_A_X0:
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*
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* Areas under curves for illuminant A (2856K), 2 degree observer.
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*/
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/**
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* VIPS_B_X0:
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*
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* Areas under curves for illuminant B (4874K), 2 degree observer.
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*/
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/**
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* VIPS_C_X0:
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*
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* Areas under curves for illuminant C (6774K), 2 degree observer.
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*/
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/**
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* VIPS_E_X0:
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*
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* Areas under curves for equal energy illuminant E.
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*/
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/**
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* VIPS_D3250_X0:
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*
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* Areas under curves for black body at 3250K, 2 degree observer.
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*/
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G_DEFINE_ABSTRACT_TYPE( VipsColour, vips_colour, VIPS_TYPE_OPERATION );
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/* Maximum number of input images -- why not?
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@ -4,6 +4,7 @@ libdeprecated_la_SOURCES = \
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im_openslide2vips.c \
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im_lab_morph.c \
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deprecated_dispatch.c \
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colour_dispatch.c \
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wrapvips7.c \
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lazy.c \
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im_dif_std.c \
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@ -38,192 +38,6 @@
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#include <vips/vips.h>
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/**
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* SECTION: colour
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* @short_description: colour operators
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* @stability: Stable
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* @see_also: <link linkend="libvips-arithmetic">arithmetic</link>
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* @include: vips/vips.h
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*
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* These operators let you transform coordinates and images between colour
|
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* spaces, calculate colour differences, and move
|
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* to and from device spaces.
|
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*
|
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* Radiance images have four 8-bits bands and store 8 bits of R, G and B and
|
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* another 8 bits of exponent, common to all channels. They are widely used in
|
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* the HDR imaging community.
|
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*
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*
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* The colour functions can be divided into three main groups. First,
|
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* functions to transform images between the different colour spaces supported
|
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* by VIPS: <emphasis>RGB</emphasis> (also referred to as
|
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* <emphasis>disp</emphasis>), <emphasis>sRGB</emphasis>,
|
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* <emphasis>XYZ</emphasis>, <emphasis>Yxy</emphasis>,
|
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* <emphasis>Lab</emphasis>, <emphasis>LabQ</emphasis>,
|
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* <emphasis>LabS</emphasis>, <emphasis>LCh</emphasis> and
|
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* <emphasis>CMC</emphasis>). Secondly, there are a set of operations for
|
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* calculating colour difference metrics. Finally, VIPS wraps LittleCMS and
|
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* uses it to provide a set of operations for reading and writing images with
|
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* ICC profiles.
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*
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* This figure shows how the VIPS colour spaces interconvert:
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*
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* <inlinegraphic fileref="interconvert.png" format="PNG" />
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*
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* The colour spaces supported by VIPS are:
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*
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* <itemizedlist>
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* <listitem>
|
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* <para>
|
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* <emphasis><code>LabQ</code></emphasis>
|
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*
|
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* This is the principal VIPS colorimetric storage format.
|
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* LabQ images have four 8-bit bands and store 10 bits of L and 11 bits
|
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* of a and b.
|
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*
|
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* You cannot perform calculations on <code>LabQ</code> images (they are
|
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* tagged with %IM_CODING_LABQ), though a few operations such as
|
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* im_extract_area() will work directly with them.
|
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* </para>
|
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* </listitem>
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* <listitem>
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* <para>
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* <emphasis><code>LabS</code></emphasis>
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*
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* This format represents coordinates in CIELAB space as a
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* three-band #IM_BANDFMT_SHORT image, scaled to fit the full range of
|
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* bits. It is the best format for computation, being relatively
|
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* compact, quick, and accurate. Colour values expressed in this way
|
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* are hard to visualise.
|
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* </para>
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* </listitem>
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* <listitem>
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* <para>
|
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* <emphasis><code>Lab</code></emphasis>
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*
|
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* Lab colourspace represents CIELAB colour values with a three-band
|
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* #IM_BANDFMT_FLOAT image. This is the simplest format for general
|
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* work: adding the constant 50 to the L channel, for example, has the
|
||||
* expected result.
|
||||
*
|
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* VIPS uses D65 LAB, but you can use other colour temperatures with a
|
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* little effort, see im_XYZ2Lab_temp().
|
||||
* </para>
|
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* </listitem>
|
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* <listitem>
|
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* <para>
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* <emphasis><code>XYZ</code></emphasis>
|
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*
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* CIE XYZ colour space represented as a three-band %IM_BANDFMT_FLOAT
|
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* image.
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||||
* </para>
|
||||
* </listitem>
|
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* <listitem>
|
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* <para>
|
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* <emphasis><code>Yxy</code></emphasis>
|
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*
|
||||
* CIE Yxy colour space represented as a three-band %IM_BANDFMT_FLOAT
|
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* image.
|
||||
* </para>
|
||||
* </listitem>
|
||||
* <listitem>
|
||||
* <para>
|
||||
* <emphasis><code>RGB</code></emphasis>
|
||||
*
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||||
* (also refered to as <code>disp</code>+) This is a generic 8-bit RGB
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* image. VIPS has a system for going to and from RGB with a simple
|
||||
* display structure, but it's mostly deprecated. See
|
||||
* <link linkend="libvips-disp">disp</link>.
|
||||
*
|
||||
* Use im_icc_export() and friends as a modern replacement.
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||||
* </para>
|
||||
* </listitem>
|
||||
* <listitem>
|
||||
* <para>
|
||||
* <emphasis><code>LCh</code></emphasis>
|
||||
*
|
||||
* Like <code>Lab</code>, but rectangular <code>ab</code> coordinates
|
||||
* are replaced with
|
||||
* polar <code>Ch</code> (Chroma and hue) coordinates.
|
||||
* Hue angles are expressed in degrees.
|
||||
* </para>
|
||||
* </listitem>
|
||||
* <listitem>
|
||||
* <para>
|
||||
* <emphasis><code>CMC</code></emphasis>
|
||||
*
|
||||
* A colour space based on the CMC(1:1) colour difference measurement.
|
||||
* This is a highly uniform colour space, much better than CIELAB for
|
||||
* expressing small differences. Conversions to and from
|
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* <code>CMC</code> are extremely slow.
|
||||
* </para>
|
||||
* </listitem>
|
||||
* </itemizedlist>
|
||||
*/
|
||||
|
||||
/* Areas under curves for Dxx. 2 degree observer.
|
||||
*/
|
||||
|
||||
/**
|
||||
* IM_D93_X0:
|
||||
*
|
||||
* Areas under curves for D93, 2 degree observer.
|
||||
*/
|
||||
|
||||
/**
|
||||
* IM_D75_X0:
|
||||
*
|
||||
* Areas under curves for D75, 2 degree observer.
|
||||
*/
|
||||
|
||||
/**
|
||||
* IM_D65_X0:
|
||||
*
|
||||
* Areas under curves for D65, 2 degree observer.
|
||||
*/
|
||||
|
||||
/**
|
||||
* IM_D55_X0:
|
||||
*
|
||||
* Areas under curves for D55, 2 degree observer.
|
||||
*/
|
||||
|
||||
/**
|
||||
* IM_D50_X0:
|
||||
*
|
||||
* Areas under curves for D50, 2 degree observer.
|
||||
*/
|
||||
|
||||
/**
|
||||
* IM_A_X0:
|
||||
*
|
||||
* Areas under curves for illuminant A (2856K), 2 degree observer.
|
||||
*/
|
||||
|
||||
/**
|
||||
* IM_B_X0:
|
||||
*
|
||||
* Areas under curves for illuminant B (4874K), 2 degree observer.
|
||||
*/
|
||||
|
||||
/**
|
||||
* IM_C_X0:
|
||||
*
|
||||
* Areas under curves for illuminant C (6774K), 2 degree observer.
|
||||
*/
|
||||
|
||||
/**
|
||||
* IM_E_X0:
|
||||
*
|
||||
* Areas under curves for equal energy illuminant E.
|
||||
*/
|
||||
|
||||
/**
|
||||
* IM_D3250_X0:
|
||||
*
|
||||
* Areas under curves for black body at 3250K, 2 degree observer.
|
||||
*/
|
||||
|
||||
/* One image in, one out.
|
||||
*/
|
||||
static im_arg_desc one_in_one_out[] = {
|
||||
@ -333,10 +333,8 @@ vips_interpolate_nearest_interpolate( VipsInterpolate *interpolate,
|
||||
{
|
||||
const int ps = IM_IMAGE_SIZEOF_PEL( in->im );
|
||||
|
||||
/* We know x/y are always positive, so we can just (int) them.
|
||||
*/
|
||||
const int xi = (int) (x + 0.5);
|
||||
const int yi = (int) (y + 0.5);
|
||||
const int xi = (int) x;
|
||||
const int yi = (int) y;
|
||||
|
||||
const VipsPel *p = IM_REGION_ADDR( in, xi, yi );
|
||||
VipsPel *q = (VipsPel *) out;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user