Digital BW, The Print

how to make .ACV file from tabular data???  Is it really limited to 
only 20 points like in the curve dialog box?  

thanks,

mark

Mark Hahn wrote:

>how to make .ACV file from tabular data???  Is it really limited to 
>only 20 points like in the curve dialog box?  
>
>  
>
No it isn't.. But you have to do the editing manually outside of 
Photoshop, or use an application to edit the ACV file that will insert 
more edit points..


 
Keith Krebs

"Just some guy," caretaker of the Multiverse's largest EPSON printer 
User Community (highly recommended by Vogon Poets and MegaDodo 
Publications), at:
http://groups.yahoo.com/group/EPSON_Printers/
and  the Multiverse's largest Canon printer User  Community at:
http://groups.yahoo.com/group/Canon-printers
"For the rest of you out there, the secret is to bang the rocks together 
guys"

Ok, thanks, but still, how do you do it?  ie. what application?  
Thanks for help in what should be simple... I just don't know how to 
do it:)

Your help is greatly appreciated!

mark

PS  I've done a fair amount of searching and came up empty handed... 
maybe just the wrong set of key words.

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Editor P.O.V. 
Image Service" <editor@p...> wrote:
> Mark Hahn wrote:
> 
> >how to make .ACV file from tabular data???  Is it really limited 
to 
> >only 20 points like in the curve dialog box?  
> >
> >  
> >
> No it isn't.. But you have to do the editing manually outside of 
> Photoshop, or use an application to edit the ACV file that will 
insert 
> more edit points..
> 
> 
>  
> Keith Krebs
> 
> "Just some guy," caretaker of the Multiverse's largest EPSON 
printer 
> User Community (highly recommended by Vogon Poets and MegaDodo 
> Publications), at:
> http://groups.yahoo.com/group/EPSON_Printers/
> and  the Multiverse's largest Canon printer User  Community at:
> http://groups.yahoo.com/group/Canon-printers
> "For the rest of you out there, the secret is to bang the rocks 
together 
> guys"

> how to make .ACV file from tabular data???  Is it really limited to 
> only 20 points like in the curve dialog box?  

I wrote a perl script once that creates .ACV files from tabular text
files. It's pretty specific in that it's only useful for linearizing a
21 step wedge. The text file has exactly 21 rows, and you need to skip 5
rows in each column to get down to the allowed 16 points that photoshop
will read.

If you insert more points than 16 (including the black and white points)
Photoshop refuses to read the file.

In the Photoshop 5.0 SDK they allow for 19 points on the curve, so they
must have cut down on the allowed number in one of the later versions.

It probably wouldn't take too much work to create a general purpose
script that could have completely separate input/output values for each
channel. Right now the input value is the same for all three channels
while the output values are different. I use this to measure a patch
with a densitometer for the input value and then I place the RGB values
for that patch at the corrected point.

Le me know if you're interested in a copy of the script.

--
Daniel Staver
http://daniel.staver.no

> Ok, thanks, but still, how do you do it?  ie. what application?  
> Thanks for help in what should be simple... I just don't know how to 
> do it:)
> 
> Your help is greatly appreciated!

Thanks Daniel,

I'd appreciate getting a copy of your script.  All I'm trying to do 
is create an overall adjustment curve to put on top of Paul's curves 
and hopefully get a smooth gradient.  As it stands now I cannot print 
anyting that has a fine gradient across it (like a side lit cylinder) 
because of the waves in the tonal space and I figured a detailed 
correction curve should be able to fix it.  16 pts seems pretty cheap 
from Adobe, though I guess they could be stacked if needed.  Going 
into ICC profiles seems like way more work and research than I'm 
willing to put in.  The other option is to do all the curves in 
something outside of PS...

Mark

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Daniel Staver" 
<daniel@p...> wrote:
> > how to make .ACV file from tabular data???  Is it really limited 
to 
> > only 20 points like in the curve dialog box?  
> 
> I wrote a perl script once that creates .ACV files from tabular text
> files. It's pretty specific in that it's only useful for 
linearizing a
> 21 step wedge. The text file has exactly 21 rows, and you need to 
skip 5
> rows in each column to get down to the allowed 16 points that 
photoshop
> will read.
> 
> If you insert more points than 16 (including the black and white 
points)
> Photoshop refuses to read the file.
> 
> In the Photoshop 5.0 SDK they allow for 19 points on the curve, so 
they
> must have cut down on the allowed number in one of the later 
versions.
> 
> It probably wouldn't take too much work to create a general purpose
> script that could have completely separate input/output values for 
each
> channel. Right now the input value is the same for all three 
channels
> while the output values are different. I use this to measure a patch
> with a densitometer for the input value and then I place the RGB 
values
> for that patch at the corrected point.
> 
> Le me know if you're interested in a copy of the script.
> 
> --
> Daniel Staver
> http://daniel.staver.no
> 
> > Ok, thanks, but still, how do you do it?  ie. what application?  
> > Thanks for help in what should be simple... I just don't know how 
to 

> > do it:)
> > 
> > Your help is greatly appreciated!