Merge branch 'master' into add-hsv
This commit is contained in:
John Cupitt
commit
bdc96844bd
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|
||||
* for you.
|
||||
*
|
||||
* Radiance images have four 8-bits bands and store 8 bits of R, G and B and
|
||||
* another 8 bits of exponent, common to all channels. They are widely used in
|
||||
* the HDR imaging community.
|
||||
*
|
||||
*
|
||||
* The colour functions can be divided into three main groups. First,
|
||||
* functions to transform images between the different colour spaces supported
|
||||
* by VIPS: <emphasis>RGB</emphasis>, <emphasis>sRGB</emphasis>,
|
||||
* <emphasis>XYZ</emphasis>, <emphasis>Yxy</emphasis>,
|
||||
* <emphasis>Lab</emphasis>, <emphasis>LabQ</emphasis>,
|
||||
* <emphasis>LabS</emphasis>, <emphasis>LCh</emphasis> and
|
||||
* <emphasis>CMC</emphasis>). Use vips_colourspace() to move an image to a
|
||||
* by VIPS: #VIPS_INTERPRETATION_sRGB, #VIPS_INTERPRETATION_scRGB,
|
||||
* #VIPS_INTERPRETATION_B_W,
|
||||
* #VIPS_INTERPRETATION_XYZ, #VIPS_INTERPRETATION_YXY,
|
||||
* #VIPS_INTERPRETATION_LAB,
|
||||
* #VIPS_INTERPRETATION_LCH, and
|
||||
* #VIPS_INTERPRETATION_CMC.
|
||||
*
|
||||
* There are also a set of minor colourspaces which are one of the above in a
|
||||
* slightly different format:
|
||||
* #VIPS_INTERPRETATION_LAB, #VIPS_INTERPRETATION_LABQ,
|
||||
* #VIPS_INTERPRETATION_LABS, #VIPS_INTERPRETATION_LCH,
|
||||
* #VIPS_INTERPRETATION_RGB16, and #VIPS_INTERPRETATION_GREY16.
|
||||
*
|
||||
* Use vips_colourspace() to move an image to a
|
||||
* target colourspace using the best sequence of colour transform operations.
|
||||
*
|
||||
* Secondly, there are a set of operations for
|
||||
* calculating colour difference metrics. Finally, VIPS wraps LittleCMS and
|
||||
* uses it to provide a set of operations for reading and writing images with
|
||||
|
|
@ -77,93 +91,53 @@
|
|||
*
|
||||
* This figure shows how the VIPS colour spaces interconvert:
|
||||
*
|
||||
* <para>
|
||||
* <inlinegraphic fileref="interconvert.png" format="PNG" />
|
||||
* </para>
|
||||
*
|
||||
* The colour spaces supported by VIPS are:
|
||||
*
|
||||
* <itemizedlist>
|
||||
* <listitem>
|
||||
* <para>
|
||||
* <emphasis><code>LabQ</code></emphasis>
|
||||
* * #VIPS_INTERPRETATION_LAB -- CIELAB '76 colourspace with a D65 white. This
|
||||
* uses three floats for each band, and bands have the obvious range.
|
||||
*
|
||||
* This is the principal VIPS colorimetric storage format.
|
||||
* LabQ images have four 8-bit bands and store 10 bits of L and 11 bits
|
||||
* of a and b.
|
||||
* There are two
|
||||
* variants, #VIPS_INTERPRETATION_LABQ and #VIPS_INTERPRETATION_LABS, which
|
||||
* use ints to store values. These are less precise, but can be quicker to
|
||||
* store and process.
|
||||
*
|
||||
* You cannot perform calculations on <code>LabQ</code> images (they are
|
||||
* tagged with %VIPS_CODING_LABQ), though a few operations such as
|
||||
* vips_extract_area() will work directly with them.
|
||||
* </para>
|
||||
* </listitem>
|
||||
* <listitem>
|
||||
* <para>
|
||||
* <emphasis><code>LabS</code></emphasis>
|
||||
* #VIPS_INTERPRETATION_LCH is the same, but with a*b* as polar coordinates.
|
||||
* Hue is expressed in degrees.
|
||||
*
|
||||
* This format represents coordinates in CIELAB space as a
|
||||
* three-band #VIPS_FORMAT_SHORT image, scaled to fit the full range of
|
||||
* bits. It is the best format for computation, being relatively
|
||||
* compact, quick, and accurate. Colour values expressed in this way
|
||||
* are hard to visualise.
|
||||
* </para>
|
||||
* </listitem>
|
||||
* <listitem>
|
||||
* <para>
|
||||
* <emphasis><code>Lab</code></emphasis>
|
||||
* * #VIPS_INTERPRETATION_XYZ -- CIE XYZ. This uses three floats.
|
||||
* See #VIPS_D75_X0 and friends for values for the ranges
|
||||
* under various illuminants.
|
||||
*
|
||||
* Lab colourspace represents CIELAB colour values with a three-band
|
||||
* #VIPS_FORMAT_FLOAT image. This is the simplest format for general
|
||||
* work: adding the constant 50 to the L channel, for example, has the
|
||||
* expected result.
|
||||
* #VIPS_INTERPRETATION_YXY is the same, but with little x and y.
|
||||
*
|
||||
* VIPS uses D65 LAB, but you can use other colour temperatures with a
|
||||
* little effort, see vips_XYZ2Lab().
|
||||
* </para>
|
||||
* </listitem>
|
||||
* <listitem>
|
||||
* <para>
|
||||
* <emphasis><code>XYZ</code></emphasis>
|
||||
* * #VIPS_INTERPRETATION_scRGB -- a linear colourspace with the sRGB
|
||||
* primaries. This is useful if you need linear light and don't care
|
||||
* much what the primaries are.
|
||||
*
|
||||
* CIE XYZ colour space represented as a three-band #VIPS_FORMAT_FLOAT
|
||||
* image.
|
||||
* </para>
|
||||
* </listitem>
|
||||
* <listitem>
|
||||
* <para>
|
||||
* <emphasis><code>Yxy</code></emphasis>
|
||||
* Linearization is performed with the usual sRGB equations, see below.
|
||||
*
|
||||
* CIE Yxy colour space represented as a three-band #VIPS_FORMAT_FLOAT
|
||||
* image.
|
||||
* </para>
|
||||
* </listitem>
|
||||
* <listitem>
|
||||
* <para>
|
||||
* <emphasis><code>RGB</code> / <code>sRGB</code></emphasis>
|
||||
* * #VIPS_INTERPRETATION_sRGB -- the standard sRGB colourspace, see:
|
||||
* [wikipedia sRGB](http://en.wikipedia.org/wiki/SRGB).
|
||||
*
|
||||
* VIPS converts XYZ to and from sRGB using the usual formula:
|
||||
* This uses three 8-bit values for each of RGB.
|
||||
*
|
||||
* http://en.wikipedia.org/wiki/SRGB
|
||||
* #VIPS_INTERPRETATION_RGB16 is the same, but using three 16-bit values for
|
||||
* RGB.
|
||||
*
|
||||
* You can also use vips_icc_transform() and friends to go to and from
|
||||
* device space with a generic profile.
|
||||
* </para>
|
||||
* </listitem>
|
||||
* <listitem>
|
||||
* <para>
|
||||
* <emphasis><code>LCh</code></emphasis>
|
||||
* * #VIPS_INTERPRETATION_B_W -- a monochrome image, roughly G from sRGB.
|
||||
* The grey value is
|
||||
* calculated in #VIPS_INTERPRETATION_scRGB space with the usual 0.2, 0.7, 0.1
|
||||
* RGB ratios.
|
||||
*
|
||||
* 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>
|
||||
* #VIPS_INTERPRETATION_GREY16 is the same, but using 16-bits.
|
||||
*
|
||||
* 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.
|
||||
* * #VIPS_INTERPRETATION_CMC -- 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.
|
||||
*
|
||||
* The CMC colourspace is described in "Uniform Colour Space Based on the
|
||||
* CMC(l:c) Colour-difference Formula", M R Luo and B Rigg, Journal of the
|
||||
|
|
@ -173,9 +147,7 @@
|
|||
*
|
||||
* You can calculate metrics like CMC(2:1) by scaling the spaces before
|
||||
* finding differences.
|
||||
* </para>
|
||||
* </listitem>
|
||||
* </itemizedlist>
|
||||
*
|
||||
*/
|
||||
|
||||
/* Areas under curves for Dxx. 2 degree observer.
|
||||
|
|
|
|||
Loading…
Reference in New Issue