Saving a true color image

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Michael
Michael 2014-7-14
评论： Image Analyst 2014-7-14
I created a true color image using values for RGB:
R = 1;
G = 0.3301;
B = 0.9;
truecolor_image = cat(3, R, G, B);
filt_image = image(truecolor_image);
Now when I try to have Matlab save this image:
imwrite(filt_image, 'Filter Color.png');
All I get is a blank white pixel. Even after re-sizing to a 300 by 300 pixel image, the figure is still white and blank. How do I save this color image?

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采纳的回答

Matz Johansson Bergström
编辑：Matz Johansson Bergström 2014-7-14
When you are calling image it returns a handle, which is a float value that you can use to modify the image in the plot window after you display it. For instance
handl = image(truecolor_image)
set(handl, 'cdata', 200)
What you are doing is writing this handle, which is a float, to a file. You want to write the actual matrix to the file. So, it is sufficient to write:
imwrite(truecolor_image, 'Filter Color.png');
  2 个评论
Michael
Michael 2014-7-14
Nice that worked well. Now would I be able to put text on top of the truecolor_image and then still save it in the same manner as well?
Image Analyst
Image Analyst 2014-7-14
No. Not unless you used the textInserter method of the Computer Vision System Toolbox. Otherwise, use export_fig.

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