How correctly to convert CMYK in RGB?

[loover]

(CMYK without profile)I write

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convert.exe 03.tif -colorspace RGB -profile sRGB.icc 03.jpg

But colours of the image in RGB look so as if the profile was not applied.

[fmw42]

I am no expert on this, but try -colorspace RGB before the input image. I have seen other posts about this. So you can search the archives also.

[loover]

How to define colour model of the image?
I use ImageMagick together with PHP and i need something like that:

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if (colormode == rgb)
{
 ...
}

[anthony]

(CMYK without profile)I write

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convert.exe 03.tif -colorspace RGB -profile sRGB.icc 03.jpg

But colours of the image in RGB look so as if the profile was not applied.

You need one profile if the image contains a profile

you need two profiles if the image does not contain the original profile!

see http://www.imagemagick.org/Usage/formats/#color_profile