Re: bitmaps
Re: bitmaps
- Subject: Re: bitmaps
- From: Ray Maxwell <email@hidden>
- Date: Wed, 14 Sep 2005 10:52:47 -0700
Hi Roberto,
Get Bruce Fraser's book "Adobe Photoshop CS". Read the chapter 17.
This is a very deep subject and cannot be answered in a paragraph.
Going from RGB to bit mapped film or plates is a two step process.
First, you have to separate to the CMYK color space of the press.
Then, you have to RIP the file to four bit map separations.
Here is a quick set of rules of thumb as a starting point:
1. Resolution...300 dpi at finale printed size.
2. Colorspace...Adobe RGB 98 (do the separation to CMYK in the RIP) or
do your own CMYK separation to US sheetfed coated.
3. Take your file to a service bureau and ask for their help.
4. Many printers can help you if you bring them a good RGB file.
Do not try to make your own bit map separation files. You need a high
quality RIP to do this properly. Get expert help.
Ray Maxwell
roberto diego torrado wrote:
Hi group,
not absolutely sure this post is relevant to this group as colour is
not the point. Anyway here it comes: till now I've have focused on
"photographic" output mostly b&w but also colour through IP on an
Epson 2200. So far so good. Now I'm getting interested on mixing
media and processes. To be more concrete: digitally captured images
printed via printing press using photopolymer plates (and/or)
photopolymer film.
The first step is get a (positive or negative) screened image on
transparent media (Agfa CopyJet in my case). This is usually a 1bit
image and as I printed composite RGB images characterised via input
and output profiles when it comes to print bitmap images on
transparent media, I'm lost. Have you got any "hint" on how to do it
right?. You know input resolution and other relevant parameters.
Thanks a lot,
Roberto Diego
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| | >bitmaps (From: roberto diego torrado <email@hidden>) |