Indexed Images for Cielab Color Space

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l.l.
l.l. 2014-10-16
评论： Image Analyst 2014-10-16
Hi!
How can I build a function indexed image for other color spaces such as CIELAB? any help..?

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Image Analyst
Image Analyst 2014-10-16
I'm not sure what that means. You can convert a color RGB image into hsv with rgb2hsv()
hsvImage = rgb2hsv(rgbImage);
and into lab with makecform():
cform = makecform('srgb2lab');
labImage = applycform(rgbImage,cform);
Creating an indexed image doesn't make any sense. You'd have to create a grayscale image and then use the proper colormap, but why? Like my demo shows, you can create RGB images that are better.
See my attached demo.
  2 个评论
l.l.
l.l. 2014-10-16
编辑：l.l. 2014-10-16
I want to get for my image in LAB space an indexed image: A data matrix, X, and a colormap matrix, map. map is an m-by-3 array of class double containing floating-point values in the range [0, 1]. Each row of map specifies the L, *a, and *b components of a single color. So the color of each image pixel is determined by using the corresponding value of X as an index into map.
Image Analyst
Image Analyst 2014-10-16
What you're saying doesn't make sense. What you're describing - an integer image with a m-by-3 colormap array is simply a normal indexed image, in essence an integer image and a pseudocolor look up table to turn the gray scale image into a color image. The colormap is a gray-to-color lookup table. It makes no sense to have a gray-to-LAB lookup table. First of all, if it's starting as gray, there is no a and b values, by definition, and the L would just go from 0 to 100. If you want LAB you're going to have to start with an RGB image, not an integer (indexed) image. There is no colormap to give you what you want.

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