re: conversion of printable colours
re: conversion of printable colours
- Subject: re: conversion of printable colours
- From: "John Swift" <email@hidden>
- Date: Fri, 16 Apr 2004 20:34:52 -0400
Roger,
You know I was just getting ready to send the example you asked for and I am
starting to think that I may have gotten bogged down by over focusing on a
single profile. I was so perplexed by the results from this printer that I
began to neglect the other profiles I had been studying, which dont seem
to display the same exaggerated results. I may simply be dealing with a bad
profile. Although it is a profile that serves me well.
Here then are concrete results, its an Epson generic profile. Im only
giving you the data from a small section where the cliff and the pond occur.
If you can make head or tails of it I would be greatly interested in any
explanation you can offer. Both conversions use black point compensation,
and all original Lab values are a* & b* =0.
I am really just trying to figure out the science of it. The only tone this
printer cant apparently produce is L*6, so why, when using relative
intent, which as you say does not compress, wont it print L* 8 to L* 18
as the control signals demand. Doesnt the fact that it produces these tones
when using perceptive intent indicate that it can physically produce them?
Thanks again, please dont knock yourself out, if this is too tangled in
knots to explain just leave it, Ill understand.
John.
Original file data Conversion Relative
Conversion Perceptive
L*
0 0., 2.-5
0, 2, -5
1 1, 1, -5
1, 2, -5
2 2, 1, -6
2, 2 -6
3 3, 1, -6
3. 1. -6
4 4, 1, -6
3, 1, -6
5 5, 0, -6
4, 1, -6
6 18, 1, 3,
5, 1, -6
7 18. 1. 3
7, 2, -5
8 20, 1, 4
8, 2. -4
9 20, 1, 4,
9, 2. -4
10 20, 1, 4
10, 3, -4
11 20, 1, 4
11, 3, -3
12 20, 1, 4
12, 3, -3
13 20, 1, 4
13, 3, -3
14 20, 1, 4
14, 3, -2
15 20, 1, 4
15, 3, -2
16 20, 1, 4
16, 3, -2
17 20, 1, 4
17, 3, -2
18 20, 1, 4
18, 4, -1
19 20, 1, 4
19, 4, -1
20 20, 1, 4
20, 4, -1
21 21, 1, 4,
21, 4, -1
22 22, 2, 2,
22, 4, -1
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