Photoshop :: CMYK Color Separation?Apr 20, 2006
if i can do CMYK color separation in photoshop?
if i can do CMYK color separation in photoshop?
For a long time I have been struggling to find a good workflow for what I would call "multi channel color separation". What I want is to reduce a full color RGB image into an image with only a limited number (e.g. 5-8) well-chosen colors, for instance to use as set of masks for screen print. (I'd also like to use this as an effect in itself, mimicking a typical 'screen print' or 'litho' effect on an inkjet print)
The idea is to create a set of monochrome layers or spot color channels. Colors are to be selected by myself (so not necessarily RGB or CMYK). Each channel/layer has to be a continuous tone that I transform myself into a dedicated half tone screen (e.g. with the Andromeda screen filter).
Till sofar it is clear to me. My issue is: How to separate the image in the predefined set of colors?
I can not just select a color range: I can adjust a "tolerance" but that is too general. I need the pixels of with a specific hue but with the full range of lightness (e.g. all the purple pixels that range from dark/medium purple to very light purple). The dark colors can be made dark with a black channel. I'm not sure how to deal with the saturation range.
An approach that gives sometimes a result that is to some extent acceptable is to transfer from RGB mode to an Indexed Color mode and use a custom palette. However, this does not give much control on the halftone screening process.
I envision for instance an approach of filling a layer with a solid given color, select in one way or another only those parts that correspond to the original image and subtract that layer somehow from the image. This process is then to be repeated for each color. Up till now I have not been able to figure the right options to do this. But maybe there is a better way to do it.
One final wish: it would be great if the process can take into account that some layers in the final print are (semi-)transparent. In my opinion this would exclude just selecting a color and deleting de pixels.
Well as much as I do design work for customers for tee shirts,I never had to do color separation, for the screens.I’m wondering how do you do this? ( how do you separate colors in corel, for screen printing) .View 4 Replies View Related
The project is a photo montage. It was 4-color, now must become 2 colors. So I've changed each of the original 4-color photos (jpg and eps) into separate psd files (as grayscale/duotone/montage-and assigned it One pantone color)
In a new psd "montage" file, I plan to place each photo on its own layer, adjust tints, transparency, etc, to create one new montage/flattened.I'm not sure which color mode is best when setting up this new file, CMYK or grayscale?
Once the PS doc is done, the job will be saved as a PDF for 2-color printing.I want to insure the 2 pantone colors separate properly at press.
i have always used a designer to come up flyer designs for events. They all go for commercial printing. Thing is when i try and design something in cmyk, the colours always go slightly dull, but yet when my designer does the design in cmyk the colours remain bright.View 5 Replies View Related
A few months ago I made the switch from X3 to X6. I use Corel for lasering, and need a RGB red hairline for the vector cutting. All of my old files were done this way, but for some reason when they are opened in X6, they are opening with a CMYK red hairline, which does not cut on my laser.
Is there a way to get this to change automatically on old files, or do I just have to do it manually as I need them? I have thousands of files, and I seem to forget to change this sometimes.
I do have it set for RGB to be my default now, so anything new I create isn't a problem -- just the old files.
Create a new document in X5. Choose CMYK as the "Primary Color Mode" in the "Create a new document" dialog box.
Draw a rectangle. The Eyedropper Tool tells me it is RGB 0, 0, 0. Shouldn't it be CMYK 0, 0, 0,100? Is there a simple way to fix this to default to CMYK?
I've got a cmyk image with nothing in the black or the cyan channels.
All I was wanting to do is make the yellow channel black and the magenta channel brown.
So, the yellow channel prints in black and the magenta channel prints in brown.
I am using CS2 Indesign and Photoshop 7 on a PC. I have to prepare color
photos for a printer located in China. They want all images to be CMYK
I now have an assortment of about 100 images from various sources around the
world, there are .tif, .jpg. .bmp, and .psd. All of them appear to be RGB.
There are images with: 1) no color profile, 2) sRGB IE60966-2.1, and Adobe
I have X5 SP1 and am trying to export in EPS. Regardless of what I choose in the export dialog (RGB or Grayscale) the resulting EPS file always has a CMYK profile embedded. As I need to submit it to a scietific journal for publishing that requires RGB or Grayscale
I already searched for any objects with CMYK fillings or contours - none. In File properties it only shows RGB and Grayscale objects.
I think I read X4 had a problem with EPS export, i. e. all vectors got converted to CMYK regardless of the export dialog choice. Is this still an issue in X5?
When I export PDF From Coreldraw X6 black color drop shadow appear in all plates.
PDF preset : prepress
OS : Windows 7 and Windows XP both
I have attached both coreldraw and pdf separation preview file.