Convert Color to Bone colormap
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I would like to load a .jpg picture and convert it to grayscale using the bone colormap. Is this possible? I need to have blue/dark blue approach white and red/dark red approach black, or vice versa.
Thanks,
Joe
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Accepted Answer
Walter Roberson
on 11 Jul 2011
If your image was originally an indexed image that was displayed (and saved) with the "bone" map, then you can reverse the color mapping and get back to the indexed image using:
indexedImage = rgb2ind(YourRGBImage, bone);
Once you have done that conversion, you can convert to an arbitrary new color map and convert that result to grayscale, by using
grayImage = ind2gray(indexedImage, NewMap);
For example, your NewMap could effectively be a gamma adjustment.
If you were custom-creating the new map and if it was just as easy to do it in gray in the first place, then you could make it a simple vector of gray levels, and use
grayImage = NewGMap(1+indexedImage);
2 Comments
Walter Roberson
on 13 Jul 2011
Perhaps instead of a screen shot, you could use print() with a resolution, or use Oliver's contribution export_fig, http://www.mathworks.com/matlabcentral/fileexchange/23629
More Answers (1)
Rick Rosson
on 11 Jul 2011
Please try:
doc rgb2gray
HTH.
1 Comment
Walter Roberson
on 11 Jul 2011
That is suitable for RGB images, but not for using a particular color map.
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