Re: Test strip for tracking drift
Re: Test strip for tracking drift
- Subject: Re: Test strip for tracking drift
- From: Andrew Rodney <email@hidden>
- Date: Thu, 04 Dec 2003 15:26:17 -0700
on 12/4/03 2:20 PM, Dennis Dunbar wrote:
>
Does anyone know of a target that can easily be read by an EyeOne? Or do
>
any of you have a suggestion for how I should create one myself? ( I
>
know I can use PhotoShop, but am not sure if there are any specific
>
parameters I need to keep in mind.)
You can build one in Logo ColorLab (free from GretagMacbeth) but it's a bit
difficult to use and there's no support or documentation. I'd actually use
the 288 patch target made for the EyeOne since it's pretty fast to measure
and the more patches you have, the better the statistics you'll get. I'm not
sure if you're trying to measure an RGB or CMYK device (the 288 is an RGB
target) but you could convert to CMYK and as long as you output that file
and then compare it later, you'll be able to use MeasureTool to load the
references and compare.
Or you might try just using a portion of that target if you really want to
just measure a few patches. The trick is having a target and a reference
file that MeasureTool can read (which really isn't a big deal). Truth be
told, I'm not sure what colors I'd pick when producing a reduced target to
keep an eye on drift. I know you want neutrals, darks, lights and a good
representation of colors. Too few and the data you get might not be all that
useful.
I did play around with ColorLab. Here's what you can try. Open an existing
reference (like the 288 target which is called i1 RGB 1.5 reference). You'll
see all the 288 colors.
Make a "New Document" and you'll be asked how many patches you wish. For fun
I picked 18 patches on 1 row (you can pick anything that fits well for
running the strip with the EyeOne. 18 is the number of patches per row in
the original i1 1.5 target). The new doc has 18 patches but the default is
all black (put the cursor over each patch and it will outline itself).
Now you need to decide what colors from the original you want. I don't have
a clue. But say you want the 2nd patch color (blue) Double click and a
dialog will present the values (in this case it's 51.00 102.00 255.00).
Select and copy.
Go over to your new target and double click and paste. That color is now
there in the reference. From here you'll have to decide what colors (and how
many) to pop into this new target.
To now create an actual file you can open in say Photoshop and print, go to
Filter>Conversion>Image. Here you have to tell the software the number of
pixels to convert this to then save to disk with a new name. You can now
open this in Photoshop and print.
Should work (built a test file but didn't test it) and I might be missing
some steps that would make this all easier (ColorLab can be a bit of a
nightmare but then it's a free, unsupported product so we're lucky to have
it).
Andrew Rodney
http://www.imagingrevue.com/
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