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diff --git a/doc/sane-xsane-color-correction-doc.html b/doc/sane-xsane-color-correction-doc.html new file mode 100644 index 0000000..62fbfed --- /dev/null +++ b/doc/sane-xsane-color-correction-doc.html @@ -0,0 +1,224 @@ +<html> +<head> + <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> + <meta name="GENERATOR" content="Mozilla/4.74 [en] (X11; U; Linux 2.2.18 i686) [Netscape]"> + <meta name="Author" content="Oliver Rauch"> + <meta name="Description" content="scan, photocopy and fax frontend for SANE"> + <title>XSane - Color correction</title> +</head> +<body text="#000000" bgcolor="#FFFFFF" link="#0000EF" vlink="#51188E" alink="#FF0000"> + + +<table> +<tr> +<td width=200> +<img SRC="xsane-logo2.jpg" alt="XSane-logo" hspace=30 align=TOP> +</td> +<td> +<blockquote> +<h1><u><font color="#009900">Color correction</font></u></h1> +</blockquote> +</td> +</tr> +</table> + + +<hr WIDTH="100%"> + +<table> +<tr> +<td valign=TOP width="200" bgcolor="#E0E0BA"> +<br> +<a href="sane-xsane-doc.html">Index</a> +<br> +<br> +<br> +<font color="#000000">Main window:</font> +<ul> +<li><a href="sane-xsane-viewer-doc.html">Viewer mode</a></li> +<li><a href="sane-xsane-save-doc.html">Save mode</a></li> +<li><a href="sane-xsane-copy-doc.html">Copy mode</a></li> +<li><a href="sane-xsane-fax-doc.html">Fax mode</a></li> +<li><a href="sane-xsane-mail-doc.html">Mail mode</a></li> +<li><a href="sane-xsane-gimp-doc.html">Gimp plugin</a></li> +</ul> +<br> +<a href="sane-xsane-color-correction-doc.html">Color correction:</a> +<ul> +<li><a href="sane-xsane-color-correction-doc.html#GAMMA">Gamma correction</a></li> +<li><a href="sane-xsane-color-correction-doc.html#BRIGHTNESS">Brightness</a></li> +<li><a href="sane-xsane-color-correction-doc.html#CONTRAST">Contrast</a></li> +<li><a href="sane-xsane-color-correction-doc.html#THRESHOLD">Threshold</a></li> +<li><a href="sane-xsane-color-correction-doc.html#RGB_DEFAULT">RGB default</a></li> +<li><a href="sane-xsane-color-correction-doc.html#NEGATIVE">Negative</a></li> +<li><a href="sane-xsane-color-correction-doc.html#AUTOENHANCEMENT">Autoenhancement</a></li> +<li><a href="sane-xsane-color-correction-doc.html#ENHANCEMENT_DEFAULT">Default</a></li> +<li><a href="sane-xsane-color-correction-doc.html#RESTORE_ENHANCEMENT">Restore</a></li> +<li><a href="sane-xsane-color-correction-doc.html#STORE_ENHANCEMENT">Store</a></li> +<li><a href="sane-xsane-histogram-doc.html">Histogram window</a></li> +<li><a href="sane-xsane-preview-doc.html#PIPETTE_WHITE">Pipette functions</a></li> +</ul> +<br> +<a href="sane-xsane-standard-doc.html">Standard options window</a> +<br> +<br> +<br> +<a href="sane-xsane-advanced-doc.html">Advanced options window</a> +<br> +<br> +<br> +<a href="sane-xsane-preview-doc.html">Preview:</a> +<ul> +<li><a href="sane-xsane-preview-doc.html#PIPETTE_WHITE">Pipette white</a></li> +<li><a href="sane-xsane-preview-doc.html#PIPETTE_GRAY">Pipette gray</a></li> +<li><a href="sane-xsane-preview-doc.html#PIPETTE_BLACK">Pipette black</a></li> +<li><a href="sane-xsane-preview-doc.html#UNZOOM">Unzoom</a></li> +<li><a href="sane-xsane-preview-doc.html#ZOOM_OUT">Zoom out</a></li> +<li><a href="sane-xsane-preview-doc.html#ZOOM_IN">Zoom in</a></li> +<li><a href="sane-xsane-preview-doc.html#UNDO_ZOOM">Undo zoom</a></li> +<li><a href="sane-xsane-preview-doc.html#AUTOSELECT">Autoselect scanarea</a></li> +<li><a href="sane-xsane-preview-doc.html#SELECT_VISIBLE_AREA">Select visible area</a></li> +<li><a href="sane-xsane-preview-doc.html#SELECT_SCAN_AREA">Select scanarea</a></li> +<li><a href="sane-xsane-preview-doc.html#MOVE_SCAN_AREA">Move scanarea</a></li> +<li><a href="sane-xsane-preview-doc.html#DELETE_PREVIEW_CACHE">Delete preview cache</a></li> +</ul> +<br> +<font color="#000000">Setup:</font> +<ul> +<li><a href="sane-xsane-setup-copy-doc.html">Copy setup</a></li> +<li><a href="sane-xsane-setup-display-doc.html">Display setup</a></li> +<li><a href="sane-xsane-setup-enhancement-doc.html">Enhancement setup</a></li> +<li><a href="sane-xsane-setup-fax-doc.html">Fax setup</a></li> +<li><a href="sane-xsane-setup-image-doc.html">Image setup</a></li> +<li><a href="sane-xsane-setup-mail-doc.html">Mail setup</a></li> +<li><a href="sane-xsane-setup-save-doc.html">Saving setup</a></li> +</ul> +</td> + + + +<td VALIGN=TOP BGCOLOR="#FFFFFF"> +<br> +<center><img SRC="xsane.jpg" alt="XSane-main-window"></center> +<br> +<br> +<blockquote> +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. +<br> +<br> +<br> +<img SRC="xsane-gamma.jpg" alt="gamma"> + +<a NAME="GAMMA"></a><b>Gamma correction:</b> + +<blockquote> +The gamma correction is a non linear correction. Black keeps black and white keeps white +<blockquote> +if the gamma value is greater than 1.0 the gray intensities are brightned +<br> +if the gamma value is smaller than 1.0 the gray intensities are darkened +</blockquote> +</blockquote> + +<img SRC="xsane-brightness.jpg" alt="brightness"> + +<a NAME="BRIGHTNESS"></a><b>Brightness:</b> +<blockquote> +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). +</blockquote> + +<img SRC="xsane-contrast.jpg" alt="contrast"> + +<a NAME="CONTRAST"></a><b>Contrast:</b> +<blockquote> +positive values increase the contrast of the image. Medium gray keeps medium gray (8 bits: 128) +<blockquote> +-100% means that all colors become medium gray +<br> ++100% means that the difference between a value and medium gray is doubled +</blockquote> +</blockquote> + +<img SRC="xsane-threshold.jpg" alt="threshold"> + +<a NAME="THRESHOLD"></a><b>Threshold:</b> +<blockquote> +defines the brightness level in % that is needed to get a white +point in lineart (black/white) mode. You have to enter some options in +the <a href="sane-xsane-setup-enhancement-doc.html">enhancement setup</a> and the +backend needs to make available a threshold option. +</blockquote> + +<img SRC="xsane-rgb-default.jpg" alt="rgb-default"> + +<a NAME="RGB_DEFAULT"></a><b>RGB default:</b> +<blockquote> +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. +</blockquote> + +<img SRC="xsane-negative.jpg" alt="negative"> + +<a NAME="NEGATIVE"></a><b>Negative:</b> +<blockquote> +This option inverts the intensities (black <-> white). It +is for scanning negatives. +<br> +<br> +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. +</blockquote> + +<img SRC="xsane-autoenhance.jpg" alt="autoenhance"> + +<a NAME="AUTO_ENHANCEMENT"></a><b>Autoenhancement:</b> +<blockquote> +If you press this button XSane tries to set good values for +brightness, contrast and gamma correction in dependance 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. +<br>If RGB default is disabled, the components for each color are set individually. +</blockquote> + +<img SRC="xsane-default.jpg" alt="default"> + +<a NAME="ENHANCEMENT_DEFAULT"></a><b>Enhancement default:</b> +<blockquote> +Sets the enhancement values to default: gamma=1.0, brightness=0%, contrast=0%. +</blockquote> + +<img SRC="xsane-restore.jpg" alt="restore"> + +<a NAME="RESTORE_ENHANCEMENT"></a><b>Restore enhancement:</b> +<blockquote> +Restores the enhancement values from preferences. +</blockquote> + +<img SRC="xsane-store.jpg" alt="store"> + +<a NAME="MEMORY_ENHANCEMENT"></a><b>Store enhancement (Memory):</b> +<blockquote> +Store selected enhancement values to preferences. +</blockquote> +</blockquote> +</td> +</tr> +</table> + +<hr WIDTH="100%"> + +<blockquote> +Author: <a href="mailto:Oliver.Rauch@xsane.org">Oliver Rauch</a> +</blockquote> + +</body> +</html> + |