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This is a standard Hue - Saturation - Lightness model
(see for instance entry on wikipedia here: https://en.wikipedia.org/wiki/HSL_and_HSV)
Note though the difference between HSV and HSL saturation, which are not the same.
The advantage of having this color selection scheme is that artists can select
shades and tints of a color easily by using the lightness slider. Also colors
are arranged on (approximated) perceived lightness on the color wheel.
Beware, Old files opened with this preference saved will crash!
Reviewers: sergey, brecht, campbellbarton
Differential Revision: https://developer.blender.org/D385
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patch from Sergey
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that cannot convert float to char without false warnings that are turned
into errors with strict flags. I expect that any real conversion
warnings can be caught on linux.
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Patch #35359 by Forest Ka.
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previous fix for 2D image painting were done, and also:
* For brushes that do masking (keeping the max contribution to a pixel limited),
the alpha from textures is now part of the mask. In many cases the logic
worked out the same and where it didn't it used to cause artifacts.
* Color interpolation for smear and soften tools now happens in premultipied
space, to avoid bleeding of RGB colors from zero alpha areas.
* Fix a few cases where byte <=> float conversion was not doing the proper
straight <=> premul conversion.
* Replace some float division by constants with multiplications, is faster.
Note: float texture painting seems to have some issues updating the OpenGL
texture, but issue was already there before this commit.
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also rename mesh_getVertexCos() --> BKE_mesh_vertexCos_get() to match curve function.
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C with gcc.
helps for finding unused functions and making functions static, also did some minor code cleanup.
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else if's
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many, also don't check uchar range after casting to int, this can still cause
overflow with large float values.
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also add rgba_float_to_uchar, rgba_uchar_to_float
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rgb_uchar_to_float and swap args (math functions mostly have dest arg first like strcpy).
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use rgb_to_grayscale in more places.
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brushes were doing curve lookups within this macro for example.
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* Accelerated sRGB <=> linear conversion using lookup table, this can speed up
loading of images in the compositor and simple renders quite a bit.
* Dithering now uses the Floyd-Steinberg algorithm. Previously it would simply
randomize each pixel slightly, adding noise, now that should be reduced.
Patch #29309 by David M.
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byte => float, float => float, byte => byte conversions with profile, dither
and predivide. Previously code for this was spread out too much.
There should be no functional changes, this is so the predivide/table/dither
patches can work correctly.
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http://markmail.org/message/fp7ozcywxum3ar7n
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convert to grayscale when saving renders rather then only writing the red channel.
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always pass rv3d argument now.
also found a bug where hex_to_rgb could use un-initialized memory.
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adjust to use floats.
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- made theme colors for mesh edge len & face angle/area display.
- use %g rather then %f for float display, trims unneeded zeros.
- store cached 2d and 3d text color as bytes rather then floats, compare when drawing to avoid setting the context.
- use unsigned char for more color functions, avoids casting to glColorubv().
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- fixed bug in paste material, exposed by stricter warnings.
- removed/renamed various shadowed vars.
- removed BGE lamp.colour, only allow lamp.color attribute.
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also fix memory leak.
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functions
By Luca Bonavita (mindrones)
From detailed description: This patch doesnt change functionality, but uses the existing color math functions from math_color.c into
sequencer_draw.c.
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the render engine assumes the RenderResult's rectf is not in linear color space when color management is disabled so the sequencer and opengl render need to follow this else it results in dark images.
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by Xavier Thomas
This adds the waveform monitor and vectorscope to the image editor 'scopes'
region, bringing it inline (plus a bit more) with sequence editor functionality,
and a big step closer to the end goal of unifying the display code for image/
comp/sequence editor. It's non-intrusive, using the same code paths as
the histogram.
There's still room for more tweaks - I modified the original patch, changing
the openGL immediate mode drawing of the waveform display to vertex arrays for
speed optimisation. Xavier can look at doing this for the vectorscope now too.
Thanks very much Xavier!
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YCbCr conversion function according to ITU-R BT.601/709 and JFIF
Clarifies color space usage in rgb->ycc conversion, doesn't change existing results.
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