If you look at Gimps Layers window after separating an image, you will witness the ingenious way in which the separation is done.It will also cover more general topics on CMYK colors and DTP.Most of the heated discussions revolve around the fact that Gimp does not support CMYK mode.
For an average home user or even professional photographers, support for separating images using CMYK color is not necessary. In fact, most of them actually accept only RGB images or convert CMYK images to RGB internally. Namely, Separate and its predecessors have no support for GCR (Grey Component Replacement) and UCR (Undercolor Removal). Also, Separate plugin (not Separate) has no support for clipping path, and there is no support for opening CMYK files in either Separate or Separate. It is called a color model, because it represents a standard way of describing colors. Words additive and subtractive suggest that light, which is essential for perception of color, is either added or subtracted before it reaches the eye. The choice of primary colors is based on belief that the combination of Red, Green, and Blue (for RGB) or Cyan, Magenta, Yellow (for CMYK) produce the greatest range visible colors. Different inks absorb different parts of the lights spectrum, and the combination of C-M-Y inks yields the greatest range of different colors. However, this is usually not true in the real world because the inks are semi-transparent and the white paper below reflects some of the light. The use of additional Black ink in printing ( K in CMYK stands for Key, or blacK) is due to this fact. It adds the necessary density to the image and makes black a black. Therefore the original (usually a digital RGB image, or a printed photograph) needs to be separated into Cyan, Magenta, Yellow, and Black components. Color-spaces formulate the relationship of physical color and the color model that we use to describe them. Those relationships (functions) can be packaged as a file in the form of ICC profiles. When separating images for press, we use the source profile (the color-space of the image to be separated) and the target profile (the color-space of the printing press the image is intended for). The ability to separate and then edit an image in CMYK mode is still a long way down the list of features to be added. However, there is a plug-in called Separate that offers a partial solution to the problem. To obtain the plugin, add one of the following two repositories to your pacman.conf. Cmyk Separation Plugin For Gimp Install ICC ProfilesHowever, if you built Separate yourself, or you are using Separate, you will need to install ICC profiles. You have to create this directory and copy any profiles there. From the Image menu, open the Separate sub-menu and pick Separate (to Colour).
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