Define a RGBa color- transparency
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Dear all,
is there a workaround to create, for example, a transparent yellow? Apparently Matlab colormap only works with RGB notations, not RGBa. My idea was: trans_yellow=[1 1 0 0.5] I want to define a transparent color, just changing the alpha value for the whole plot does not work for me.
Thanks!
1 个评论
deeksha rastogi
2016-12-31
移动：DGM
2022-11-8
but what are the exact working of alpha matting and please write down its source code in matlab.
回答（4 个）
Rini Varghese
2016-4-5
1 个投票
You can modify most object colors with 4 input arguments (RGBa notation) in MATLAB (2015). E.g. rectangle(x,y,w,h,'facecolor',[0 1 0,0.08]) will yield a transparent green box. Hope this helps!
Currently, the colormap function does not accept more than 3 arguments. However,you can use the TIFF class in MATLAB to specify the alpha parameter for the image.
To read RGBA image, you can use readRGBAImage(),readRGBATile() or readRGBAStrip() functions. These functions reads image data as RGB, with associated alpha parameter.
Image Analyst
2014-7-3
0 个投票
Perhaps - take a look at Steve's blog and see if it's what you want: http://blogs.mathworks.com/steve/2009/02/18/image-overlay-using-transparency/
Image Analyst
2022-11-8
0 个投票
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2022-11-8
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