Legacy ImageMagick Discussions Archive

OK, here is the solution I am using. First, it was helpful for me to realise that the source of my problems was not really the bit depth of the image, it was the color space. Moving from sRGB to RGB or Grayscale was imposing a transformation that was affecting the image histogram (making the image ...

Solved - will supply details tomorrow.
Cheers,
4Shades

oh, ok. Then my problem is that the third-party program won't accept the 16-bit sRGB, so I have to get it into RGB colorspace without darkening it.

The reason I want this is that the final 16-bit image will be fed into a third-party image analysis program to generate a digital terrain; the third party program wants 16-bit grayscale and there are no settings I can tweak to get the program to accept a different encoding.

Sorry to be so obscure! Here are the histograms of the two images: 8-bit http://seowhq.net/meta/IM/im_8b_histo.png 16-bit http://seowhq.net/meta/IM/im_16b_histo.png You can see that in the 16-bit image (linear RGB) the histogram is shifted to the left, making the image look darker than the nonlinear ...

Thanks guys, very helpful, Fred's simple command works. :D Taking up the point about sRGB vs RGB, going from sRGB to RGB tends to darken things. If I did want to convert faithfully to RGB (or Grayscale) I suppose I would have to transform each pixel from sRGB into RGB in such a way as to maintain ...

Hi everyone, I am using ImageMagick v6.8.1-6 in a PHP application (using exec() system calls to run ImageMagick executables) on a Windows platform. One task I am trying to do is take an existing 8-bit sRGB image and convert it to 16-bit RGB. These are always grayscale images, that is R=G=B for each ...