用免费RIP软件GutenPrint来驱动打印机（高手来讨论）

uulacky

Dear 移动通信, you are welcome.

You're successful, get right answer, but isn't a perfect way.
Please note that there is a powerful command to do that in PS
named " Covert to profile ",  changing the color data to print out
color space, while  keeping the same color appearance,  easy
to get File with embedded ICC. That's all.

Good luck!

移动通信

原帖由 uulacky 于 2010-11-16 04:47 发表
Dear 移动通信, you are welcome.

You're successful, get right answer, but isn't a perfect way.
Please note that there is a powerful command to do that in PS
named " Covert to profile &q ...

Hi，uulacky:

我开了一个新的帖子，讨论、分析如何用Gutenprint墨量控制功能制作完美ICC的技术可行性，请移步这里：

http://bbs.inknet.cn/viewthread.php?tid=152081&extra=page%3D1



Title:《用Gutenprint控制出墨量与制作完美ICC的技术讨论（高手请进）》

[ 本帖最后由 移动通信 于 2010-11-16 18:28 编辑 ]

kaiyuanyinwu

在cdr做的图，保存为tif格式在ps cs5中利用Gutenprint软件打印，图中灰度打印不出来，是什么原因呢（打印黑色正常）？原图如下。，另外请教下软件里面composite gamma选项是什么作用？一般选择多大值？

kaiyuanyinwu

顶下

uulacky

Hi there  kaiyuanyinwu ,

You can reduce  the "Brightness" a little bit in the
"Adjust Output" dialog to print out the background
grey color. Try it again.

Good luck!

kaiyuanyinwu

谢谢你的指导，我分别降低 "Brightness"到0.8、0.6、0.3（默认是1.0）实验了下，图片背景灰度在0.8的情况下稍微有点（0.6和0.3情况下比0.8还浅），但是还是不正，表现在三方面：1、灰度浅；2、横着的那条深黄色线颜色不正（原文件为Y=100，K=18，但打印出来感觉没有黑色参与，却感觉有红色参与）3、竖着的那条浅黄色线条打印出来色彩很淡很浅（原文件Y=60）

[ 本帖最后由 kaiyuanyinwu 于 2010-11-20 09:14 编辑 ]

kaiyuanyinwu

尝试了下，将composite gamma值设置为1.0时，灰色打印正常，但是色彩不准了，将composite gamma设置为1.8时，色彩很准，但是灰色和浅色很难打印出来，这是什么原因呢？composite gamma起什么作用？

移动通信

原帖由 kaiyuanyinwu 于 2010-11-20 09:11 发表
谢谢你的指导，我分别降低 "Brightness"到0.8、0.6、0.3（默认是1.0）实验了下，图片背景灰度在0.8的情况下稍微有点（0.6和0.3情况下比0.8还浅），但是还是不正，表现在三方面：1、灰度浅；2、横着的 ...

我觉得是不是可以尝试调整Gutenprint中的Gray Generation Controls参数试试看。
用户手册上是这么说的：

These controls adjust the conversion of gray into black ink and composite (CMY) components.
When printing in color, light grays are often printed using composite inks rather than black ink
to reduce the speckling effect of dark black dots, while dark grays and black are usually printed
using black ink to achieve a darker black. With some ink and paper combinations it is necessary
to use a mixture of black and composite components to achieve maximum density and in some
cases to achieve neutral grays (some pigment black inks are actually brown).
The effect of using too much or too little black ink varies. Typically if too much black ink is
used light colors and grays will have noticeable speckling from the black drops, while if too
little black ink is used the midtones and dark tones will be washed out and in some cases too
much ink will be used leading to puddles on the page. In some cases very large amounts of
composite ink cause color shifts (darker grays are not neutral). Epson Premium Glossy Photo
Paper seems to be particularly prone to this problem, particularly with dye inks.
In general, lower-quality papers require more black ink (composite inks generally cannot create
very dark tones), while higher quality papers require less black ink (the composite inks can
create much darker grays, and the black dots appear much sharper).
Setting these controls effectively requires a good understanding of gray generation and a fair
amount of experimentation. Normally it's only necessary to set the paper type correctly to get
good results.
These options are all new to Gutenprint 5.0.

移动通信

Hi，uulacky:
   How to adjust Output Linearization Controls in  GutenPrint ?

uulacky

Dear kaiyuanyinwu,

很对不起叫你化时间做无结果的试验了。
看到你最初的帖子，觉得很奇怪。一般来说，打图片色彩不对是常有的事，
但背景色出不来，有点奇怪。我就把你上传的图Copy回来在我的机子
上试了一下，把亮度从 reset 1.000 降低至 0.950, 背景色就出得很好。
色彩对头与否，那是调色的事了。当时我看了你的图的内容像是一般的文件图，
因此以 graphic处理, 没有按 Photography来试。因为我完全不知道什么
图，什么打印纸，打印机，什么要求，Gutenprint 怎么设置。至于打印
Photos or pictures, 我是全部用 ICC 色彩管理打印的，从不使用手工调色，
故一无经验可言。
很抱歉，再说声对不起了，叫你白化时间了。