RGB tiff to LAB

[fredsmith999]

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

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convert ducks.jpg -set colorspace LAB lab.tiff

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!

[snibgo]

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-set colorspace LAB

That tells IM that the pixel values in the image really represent Lab, not sRGB or anything else. What you want is:

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-colorspace LAB

This changes the values in the pixels, from sRGB or whatever the image is currently, to Lab.