JPEGS in RGB vs CMYK (converted through PDF)

[Cwilk]

I recently got a file from another designer where all of the files that are links are small JPEGs in RGB format. These were the photos the other designer actually used for the print ad in the InDesign file I'm now utilizing.

My question is...if the other designer did in fact use JPGs (which I know you can do), if they are in a RGB format and converted through Acrobat to CMYK (as a PDF) , wouldn't there be color problems with the file?

[LeadMagnet]

What kind of problems? If Acrobat converts to CMYK as well as photoshop does (i'm guessing it uses the exact same algorithms) then it probably would have matched the CMYK to the RGB quite well. The colours will be slightly different from the RGB most likely, that's always the case.
It's not gonna break the printer or anything.

I think i must be missing your point.

[Toon]

I would ask for the other printers colour profiles then you know they'll be the same

[Cwilk]

I know that you can set a PDF file to save as CMYK. But I'm still doing it in Photoshop so that I can do proper color correction. I'm just wanting to know the ramifications if it's done on the PDF end with no color correction.

Seems scary to me to convert at the PDF stage, but I want to find out if anyone had noticed a difference in color doing it this way.

[Zaoris]

Normally there shouldn't be any problems (that because the file he/she sent you is a .jpg)
The pdf shouldn't change anything, it's the color mode that does that.

[Cwilk]

Originally Posted by Zaoris

Normally there shouldn't be any problems (that because the file he/she sent you is a .jpg)
The pdf shouldn't change anything, it's the color mode that does that.

I'm coming back to this old thread I had started because I guess I never explained myself that well.....

I understand that the PDF shouldn't change anything, and the color mode does, but does a color mode change done through the PDF change the color any different over doing it in Photoshop? I'm still trying to find out if anyone sees a noticeable color shift doing the RGB to CMYK in Photoshop vs doing it when you convert to PDF?

[drewbie_wan]

i would do in photoshop not acrobat.. cause the the color profile will have a huge affect on the color out put. im not sure if you can assign color profiles in acrobat. like toon said before your best bet is to get the printers color profile and convert your files to that. then make adjustments

[Cwilk]

Thanks Drewbie...I honestly already convert all of my files in PS, but the reason my question came up is because I inherited another designers files and they didn't change the DPI or convert photos to CMYK. They did all of those changes/modifications in Acrobat. So I just continued to do it that way so I didn't have to redo all of their work and not get paid for it.

I've been doing color correction on computer as well as press for years and I had never seen another designer do it that way before. So my question was mainly out of curiosity.

[drewbie_wan]

i think the previous designer must not have had much experience with color correction.