I have a good friend looking for assistance in CS2 re printing

gus

Here is his plea...i havnt got a clue so was wondering if anyone here can help out ?

---

Gidday Mate!

I wonder if you can help me with a jpeg file issue?

I have a CD supplied by a professional photographer with hi-res RGB jpeg
files - when we convert the files to CMYK for offset printing we end up with
a horrendous bitmap like pattern in each colour channel - particularly with
the yellow channel.

We have had this happen before - but don¹t know a way around it.

We're running PhotoShop CS2 and don't normally have any problems, do you
photographer types have some sort of additional compression option on the
cameras that can cause this?

Do you - or your peers - have any suggestions on getting around this in
PhotoShop?

I have spoken with pre-press guys at various commercial printers and they
know of the problem - but not of a fix. In fact they'd like an answer as
well.

Regards

edgework

Humungus wrote:

Here is his plea...i havnt got a clue so was wondering if anyone here can help out ?

---

Gidday Mate!

I wonder if you can help me with a jpeg file issue?

I have a CD supplied by a professional photographer with hi-res RGB jpeg
files - when we convert the files to CMYK for offset printing we end up with
a horrendous bitmap like pattern in each colour channel - particularly with
the yellow channel.

We have had this happen before - but don¹t know a way around it.

We're running PhotoShop CS2 and don't normally have any problems, do you
photographer types have some sort of additional compression option on the
cameras that can cause this?

Do you - or your peers - have any suggestions on getting around this in
PhotoShop?

I have spoken with pre-press guys at various commercial printers and they
know of the problem - but not of a fix. In fact they'd like an answer as
well.

Regards

Can he put up a link to one of the images just as it is off the CD?

gus

I doubt it as he deals with some serious sports stuff on a national level & © would play heavily.

I will ask though or see if he can crop some of the 'ugly' bits & send it to me so i can put it up.

Tks
Gus

DavidTO

Humungus wrote:

I doubt it as he deals with some serious sports stuff on a national level & © would play heavily.

I will ask though or see if he can crop some of the 'ugly' bits & send it to me so i can put it up.

Tks
Gus

How about you let him upload to a private gall on your site with a guest password and you PM edgework the link to the image? No public views, and he gets the help he needs.

gus

DavidTO wrote:

How about you let him upload to a private gall on your site with a guest password and you PM edgework the link to the image? No public views, and he gets the help he needs.

Thats an idea...

Shay Stephens

From what I have seen, the problem usually is two fold, it lies in the camera color space and the light used to illuminate the scene. If the lighting is deficient in a particular color, in the CMYK you can get a bad channel(s).

If the image was captured in RAW, then perhaps outputting it in a larger color space and delivering a TIFF may help in the conversion process.

Just as a side note, some fluorescent\sodium\mercury lights are fairly deficient in red, and that is usually the RGB channel that gets hit the hardest making CMYK conversions really wonky. Using filters on the camera at capture time that reduce the blue and green components to better match the red channel can help. You loose some light, but if you are getting bad color artifacts, it may be worth it.

Humungus wrote:

Here is his plea...i havnt got a clue so was wondering if anyone here can help out ?

gus

tks shay i have passed your thoughts on.

Art Scott

have you thought of running them thru Genuine Fractals Print Pro...it works in the cmyk workspace and may help and I believe they have a free trial download.

gus

edgework wrote:

Can he put up a link to one of the images just as it is off the CD?

PM sent mate

gus

Art Scott wrote:

have you thought of running them thru Genuine Fractals Print Pro...it works in the cmyk workspace and may help and I believe they have a free trial download.

Thanks art...i have passed the suggestion on.