Some filters, such as the Render filters, are disabled in CMYK. To get
around this, work in RGB mode with CMYK preview turned on (CTRL/CMD+Y).
Build your file as normal; when you are finished, convert it to CMYK.
This will allow all the filters to work, give you a smaller file, and
you won’t lose your colors when you convert the file. Only use CMYK for going to a commercial printing press.
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