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Author Topic: colour profile for printing  (Read 849 times)

Benoite

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colour profile for printing
« on: October 09, 2014, 03:06:16 am »

The printer I use have requested I use a a specific colour profile for the files, however the person who now has the files and will be sending them off to print does not have photoshop or any other pro software. So any suggestions what software to use on a mac to do this?
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BobShaw

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Re: colour profile for printing
« Reply #1 on: October 10, 2014, 06:10:26 pm »

Does the file have a profile embedded? iPhoto may be able convert to but haven't checked. Preview can only assign a profile I believe, but you should be able to download 30 trials of pretty much anything and convert it. Sounds like you need a new printer if they can't convert themselves.
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howardm

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Re: colour profile for printing
« Reply #2 on: October 10, 2014, 10:13:38 pm »

well, it's mega-geeky (command line and all that including having to download and install it) but the 'convert' command in the ImageMagick suite will do that (using the '-profile' option).

-profile filename
+profile profile_name

Manage ICM, IPTC, or generic profiles in an image.   
Using -profile filename adds an ICM (ICC color management), IPTC (newswire information), or a generic profile to the image.

Use +profile profile_name to remove the indicated profile. ImageMagick uses standard filename globbing, so wildcard expressions may be used to remove more than one profile. Here we remove all profiles from the image except for the XMP profile: +profile "!xmp,*".

Use identify -verbose to find out which profiles are in the image file. Use -strip to remove all profiles (and comments).

To extract a profile, the -profile option is not used. Instead, simply write the file to an image format such as APP1, 8BIM, ICM, or IPTC.

For example, to extract the Exif data (which is stored in JPEG files in the APP1 profile), use.

$ convert cockatoo.jpg profile.exif

It is important to note that results may depend on whether or not the original image already has an included profile. Also, keep in mind that -profile is an "operator" (as opposed to a "setting") and therefore a conversion is made each time it is encountered, in order, in the command-line. For instance, in the following example, if the original image is CMYK with profile, a CMYK-CMYK-RGB conversion results.

$ convert CMYK.tif -profile "CMYK.icc" -profile "RGB.icc" RGB.tiff

Furthermore, since ICC profiles are not necessarily symmetric, extra conversion steps can yield unwanted results. CMYK profiles are often very asymmetric since they involve 3−>4 and 4−>3 channel mapping.
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