From 2d113e8792747151bf5d830f1a1485f2f951f940 Mon Sep 17 00:00:00 2001 From: Mattia Rizzolo Date: Fri, 3 Oct 2014 14:04:58 +0000 Subject: Imported Upstream version 0.50 --- doc/sane-xsane-enhancement-doc.html | 101 ++++++++++++++++++++++++++++++++++++ 1 file changed, 101 insertions(+) create mode 100644 doc/sane-xsane-enhancement-doc.html (limited to 'doc/sane-xsane-enhancement-doc.html') diff --git a/doc/sane-xsane-enhancement-doc.html b/doc/sane-xsane-enhancement-doc.html new file mode 100644 index 0000000..32c1d05 --- /dev/null +++ b/doc/sane-xsane-enhancement-doc.html @@ -0,0 +1,101 @@ + + + + + + + + XSane - Enhancement + + +  +
+
+ +
  +
+

+Enhancement

+XSane uses a gamma table to do the following enhancement functions. If +the scanner supports a custom gamma table (and the option is enabled) XSane +uses the scanner internal gamma table with the scanner's maximum bit depth.
+ +
+ +
  +
+ Gamma correction:
+ +
The gamma correction is a non linear correction. Black keeps +black and white keeps white +
if the gamma value is greater than 1.0 the gray intensities +are brightned +
if the gamma value is smaller than 1.0 the gray intensities are darkend
+
+ +
+ Brightness:
+ +
positive values increase the brightness of the image. All values +are increased by the same value. 100% means a shift of the half value range +(on 8 bits (256 values) this means a shift of 128).
+ +
+ Contrast:
+ +
positive values increase the contrast of the image. Medium +gray keeps medium gray (8 bits: 128) +
-100% means that all colors become medium gray +
+100% means that the difference between a value and medium gray is +doubled
+
+ +
+ RGB default:
+ +
if RGB default is activated, all values for the color components +(red, green and blue) are set to the default values (gamma=1.0, brightness=0%, +contrast=0%). If you deactivate it, you can set different enhancement values +for each color.
+ +
+ Negative:
+ +
This option inverts the intensities (black <-> white). +It is for scanning negatives. +

Negatives do not only have inverted colors, it also is necessary +to do a color correction for each color component because the negatives +have very different color ranges for each color.

+ +
+ Autoenhancement:
+ +
If you press this button XSane tries to set good values +for brightness, contrast and gamma correction independance of the selected +part in the preview window. This does work quiet well for brightness and +contrast, but the gamma correction normally has to be corrected manually. +
If RGB default is disabled, the components for each color are set +individually.
+ + Enhancement default: +
Sets the enhancement values to default: gamma=1.0, brightness=0%, +contrast=0%.
+ +
+ Restore enhancement:
+ +
Restores the enhancement values from preferences.
+ +
+ Store enhancement (Memory):
+ +
tore selected enhancement values to preferences.
+
+ +
+
+
INDEX
+ +


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