Legacy ImageMagick Discussions Archive

I have a jpeg (that I want to use an argyll cms utility on). It needs to be first converted to a LAB tiff. I tried but the colours were weird. The original was blueish. The new one had a orange sky. I tried using gimp to save it as a tiff before conversion. No difference. I am new to imagemagick and I assume the answer is obvious but I tried googling it and couldn't find anything.

Can anyone help? Thank you!

That tells IM that the pixel values in the image really represent Lab, not sRGB or anything else. What you want is: This changes the values in the pixels, from sRGB or whatever the image is currently, to Lab.