# Re: Umax 1220s scans 'dark'.

leila belhadjali (leilab@aa.net)
Thu, 15 Oct 1998 12:20:06 -0700 (PDT)

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Ok, I did try that!

Anytime I make a change to gamma I get an error:
"Failed to set value of option red-gamma table: Invalid Argument"
even when I have not touched the red gamma.

If I just change the image intensity, (I tried 1.1, 1.5 and 2.5) I get
a light cyan and and white image. Changing that gammas on the colours
as well nets me a black image with some red dots.

Thanks,
leila.

--------------------- message from Oliver Rauch ---------------------
|
| leila belhadjali wrote:
|
| > I am new at this, so bear with me, ok?
| >
| > I have a UMAX1220S running with Rebhat 5.0, wiht some patches.
| > For frontend I use Gimp version 0.99.28, xscanimage is 0.74
| >
| > The scanner works fine, but the results are much darker than the
| > originals and I can't find anywhere to 'lighten' them up before
| > scanning. I do use the Gimp to correct afterwards, but it's a pain
| > because I have lots fo scanning to do.
| >
| > Any ideas? Is there a specific gamma correction I should be using?
| > I am not real fluent with Gamma stuff! :(
| >
| > I have *not* hooked the scanner up to any MS box (don't have one:)
| > so I don't know if it's a hardware issue.
| >
| > Thoughts/comments/suggestions welcome!
| >
|
| Hi Leila,
|
| enable the "Use custom gamma table" button,
| there you can enter a gamma value and modify the gamma table!
|
| Gamma-values greater than 1 make the image brighter (try 1.5 - 2.5)
|
| Bye
| Oliver
|
|
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