Changing CMYK colors HELP !

[gricepeme]

Hi there !!
I'm not an expert on Photoshop but i do what i can, so i made an image to my cousin and she wants to print that image in a big size but the place were she wants to print it told me that i had to change the image to CMYK and then change black to 50-50-50-100 and blue to 100-60-0-10, cause they use CorelDraw but i don't know how to do that in photoshop. i mean i went to image-->mode-->CMYK color.
but then i don't know how to change those things about black and blue, i don't know what else to do
any idea?

 

[alix888]

pick a color

I hope you still have your original design in layers. Then after converting to CMYK (without flatting layers), color your "black layer" with the black color they had specified. You can do it by using layer effects:
1. choose "Color Overlay" ("f" letter in the Layer Palette),
2. click on a red color box in the appeared menu box, type:
C: 50%
M: 50%
Y: 50%
K: 100%
3. click OK.

And the same for the blue color, just use other numbers specified for the blue.

Of course this will work only if you use flat color layers. The idea is just pick the color by typing the numbers and then you can paint, color, apply gradients depending on your artwork.

cheers,
alixia

 

[Nomission]

First, to learn what we are talking about: read this
What CorelDraw has to do with the fact that you want to print something designed in Photoshop?
If you click the set color button you'll see that there are four color spaces. HSB, CMYK, LAB and RBG. Each one have their values. Photoshop is so smart, that it converts everyting for you. So, all you have to do is paint(or change) your "blacks" with 50-50-50-100 CMYK (or 5-0-0 RGB) and do the same for the "blues" .

 

[SeanyOB]

Like Nomission, I have no clue what CorelDraw has to do with the printing of your image. And, did you send the print back to 1996 to get it printed?

Working on the assumption that you used the standard black RGB (0 0 0), and then converted it to CMYK, your new black color is c75 m68 y67 k90. Assuming again that your printer is not a digital printer, they are requested a max density of 250. You get that number by adding your four ink totals together, which is currently 300. The easiest way to fix this problem is by creating a new Selective Color Adjustment Layer. Layer -> New Adjustment Layer -> Selective Color. Hit OK. Now change your color selection to black. Adjust your sliders to a point where your density is at 250.

Optimal setting for a standard RGB black to 250 would be: Cyan -35, Magenta -28, Yellow -25, Black +100.

As far as the blue. I have no clue why they would care. It's your image!