PNG image created in Matlab shows up as all black in imshow

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Megan
Megan 2013-12-9
评论： Oliver Woodford 2013-12-10
Hello,
I wrote some Matlab code that deBayers an image and writes the new RGB image out as a 3 x 16-bit png file:
imwrite(deBayeredImage, outputFileName, 'png', 'Bitdepth', 16);
Although the values are encoded as 16-bit, the actual range of values is 12-bit (ie, 0-4095).
If I load the image using A = imread('image.png'), the values appear reasonable. However, if I try to display the file using imshow (imshow(A) or imshow('image.png'), the display is all black, even though clicking on pixels in the figure shows the RGB values.
I thought that maybe I needed to reset the scale, but imshow(A, [0 4095]) does not change the all-black display.
Any idea what is going on?

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Oliver Woodford
Oliver Woodford 2013-12-9
If you read the imshow help text, you'll see that the range only applies to grayscale images. Try:
imshow(double(A)/4095);
or
imdisp(A, [0 4095]);
where imdisp can be found on the File Exchange.
  2 个评论
Megan
Megan 2013-12-9
I thought that Matlab could handle png images with integer values if they were 8 or 16 bit. Is that just for writing/reading?

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