Problem with imwrite a color image
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I am trying to save the output color image of a program as a jpg or png file. I have tried
outfile='image.jpg'
imwrite(im2uint16(Image),outfile,'BitDepth',12,'Mode','lossless','Quality',100)
When i tried to open this using Gimp or ImageMagick , the image could not open, it was not recognized. Can anyone suggest the right way to save a color image as a jpg using imwrite? Thank you.
4 commentaires
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Image Analyst
le 14 Août 2018
Photoshop doesn't recognize it either. But this works:
rgbImage = imread('peppers.png');
outfile='image.jp2' % JPEG 2000
imwrite(im2uint16(rgbImage),outfile,'Mode','lossless')
And I'd recommend you use PNG rather than JPG or JPEG2000 (jp2).
PNG has pretty much become the widespread de facto standard.
8 commentaires
Walter Roberson
le 15 Août 2018
Modifié(e) : Walter Roberson
le 15 Août 2018
writejpg>set_jpeg_props would never be called for file extension .png .
If you go the dual-file route, then
imwrite(im2uint16(rgbImage), 'newimage.png'); %for archive quality
imwrite(im2uint8(rgbImage), 'newimage.jpg'); %for quick access that is not archive quality
Plus de réponses (1)
Walter Roberson
le 14 Août 2018
JPEG does not support 16 bit images. Some JPEG libraries support 12 bit images.
JPEG XR supports 16 bit images, but MATLAB does not support JPEG XR.
8 commentaires
Walter Roberson
le 16 Août 2018
.. So write two copies of the image like I suggested, one archive quality and the other reduced bit depth for speed.
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