Re: Chart Reference file
Re: Chart Reference file
- Subject: Re: Chart Reference file
- From: Marco Ugolini <email@hidden>
- Date: Thu, 17 Aug 2006 22:28:29 -0700
In a message dated 8/17/06 1:13 PM, Jon Crook wrote:
> How do I create a reference file from a chart that I created in Illustrator.
> I also want to be able to read this chart with my Eye-One iO.
1) First of all, decide whether the file is supposed to be in CMYK or RGB
color mode. Then make sure that the patches are arranged as squares in a
grid of so many horizontally by so many vertically, butted right next to one
another (no space in between, neither horizontally nor vertically).
2) Export the Illustrator file as a TIFF (File -> Export...): make sure the
color mode is the correct one (RGB or CMYK); the resolution can be safely
set as low as 72ppi; select *no* Anti-Aliasing and *no* LZW Compression; the
byte order can be either IBM PC or Macintosh; do *not* embed an ICC profile
(since this is a chart and all you need are the color *numbers*, not their
absolute appearance).
3) Get a copy of Gretag Macbeth's free program ColorLab at this URL:
<http://www.gretagmacbeth.com/index/products/products_color-mgmt-spec/produc
ts_professional-cm/products_pm5packaging/products_pm5-packaging_sw.htm>
Scroll down the Web page until you find "ColorLab 2.8.12 freeware" for
either Mac or PC, depending on your platform. You will have to register to
the site before you're allowed to download the application. Once downloaded,
then install it.
4) Use ColorLab to open the TIFF file that you made in step 2.
5) Once it's open, the colors in the file are likely to look a bit strange,
but that's only because this application is not color-managed (paradoxically
enough!). Now go to the Filter menu, choose "Layout and Format" and then
"Spot Colors..." (don't let the terminology confuse you: these are not the
same spot colors that you know from the PANTONE Color Matching System. It's
just the way ColorLab calls color patches).
6) In the ensuing dialog box, in the "Width" box enter the precise number of
columns of your grid, and in the "Height" box the number of rows. Click OK.
CAREFUL: *Be precise*, or you will mess up your color numbers!
7) Now, still in ColorLab, go to File -> Export..., and in the pull-down
menu under "Format" (in the bottom section of the dialog box) select "Text
Files". Name your file (leaving the ".txt" suffix at the end of the file
name). You are done: you have created your reference file from the chart you
created in Illustrator. This file will be accepted as valid by ProfileMaker
and MeasureTool.
Have fun!
--------------
Marco Ugolini
Mill Valley, CA
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