From: JUAN MIGUEL JUSDADO (jusdado@teleline.es)
Date: 08/15/03-01:05:31 AM Z
Thank you Ender or Marck?, for their answer. I have understood that it can be a calculation error or interpretation.
Truly I am a stubborn one, but I have to understand in the way that the process works of negative digital.
There is a paragraph that I have not understood anything, I reproduce it for if it can clarify better.
Ender said: "In fact, does if you wish to split-up live hairs from the magic brush, is there anyone noticed that some steps between 0 and 255 don't even exist in Photoshop? Try making to step in to grayscale steptablet that is equal to the level of 6:) "
I don't understand.
I am Spanish, I write in Spanish and I translate with a program call "POWER TRASLATOR." I ignore if it is available in the net.
Thank you again.
Pardon for my English, text translated by computer
-----Mensaje original-----
De: Ender100@aol.com [mailto:Ender100@aol.com]
Enviado el: viernes, 15 de agosto de 2003 2:30
Para: alt-photo-process-l@sask.usask.ca
Asunto: Re: Modifications Curve III
I admire your persistance.
I'm not sure what your reference to Dan's Curve and inverting, etc have to do with the whole thing, but just looking at the tables you show, I am going to make a wild guess here. If I am wrong, blame it on my Mac>Windows translator.
I am assuming that you are looking at two different step tablets that have the same percentage values labeled on the steps.... 0%, 5%, 10%, .....95%, 100%. However, the values of the steps don't seem the same when you look at the levels from 0-255?
From your two examples, at 10%:
First steptablet shows 10%=27
Second Steptablet shows 10%=25
If this is your concern, then what you are referring to is a known "feature" of Photoshop—not all % levels are created equal. Also, not all steptablet makers are consistent in creating steps that are linear. Actually it is a rounding error/issue. When you think about the math, %'s represent 255/100 or 1% = 2.55. So, values get rounded off....and you can enter a number of nearby levels to set a tone and still get the same percentage. In the case of the two steptablets you are referencing, it is probably is just sloppy work building one or both steptablets—the problem is that in some areas of density, haveing two steps that differ by 5 levels MORE than you are expecting could wreak a small amount of havoc on what you are seeing. Then on the other hand, the average person reading this is probably scratching their head right now muttering something about spitting hairs of a magic brush. They just make a gradient and use the posterize command set at 21 steps.
I am working on a system that will eliminate above problem.
In fact, if you wish to split more hairs from the magic brush, has anyone noticed that some steps between 0 and 255 don't even exist in Photoshop? Try making a step in a grayscale steptablet that is equal to the level of 6 :)
Hope the above has been helpful. By the way, which translating system are you using? Is it one available online? Which language are you translating from? What happens when you translate the ouput back into your language?
Mark Nelson
In a message dated 8/14/03 5:32:28 PM, jusdado@teleline.es writes:
William, Ender, thank you to answer. The difficulty of the language can be
the reason of not having understood my question.
Please, follow these steps in their computer:
Open a Step Tablet and check the values from the 0 to 255 for the tones of
gray.
it will check the following values:
5%=14
10%=27
20%=53
30%=79
40%=102
50%=129
60%=156
70%=180
80%=205
90%=230
95%=242
100% = 255
OK?.
Open an image anyone p.e. "OLÉ NON MOIRÉ", apply a Curve of Adjustment for
process of some alternative process, p.e. a curve for platinum (published
for they Give Burkholder), invest the image to negative, now open the
dialogue box of Curved and the curve will be shown with its points. Check
the value of the points now, they are no longer I eat before, now they are:
5%=13
10%=25
20%=51
30%=76
40%=102
50%=127
60%=153
70%=178
80%=204
90%=229
95%=242
the values of the tones of gray have varied. has reason varied?
As I can give more contrast to a curve than I already have designed?
thank you.
Pardon for my English. Text translated by computer.
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