Mercurial > hg > digilib-old

comparison servlet/doc/Scaler.html @ 109:200584e60a0b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Updated with Version 1.9
author robcast
date Wed, 14 May 2003 00:11:15 +0200
parents 6f4c01ab13c4
children 737f5cd647e1
comparison
equal deleted inserted replaced
108:ffc7d9138397 109:200584e60a0b
4 <TITLE>Scaler servlet</TITLE> 4 <TITLE>Scaler servlet</TITLE>
5 </HEAD> 5 </HEAD>
6 <BODY> 6 <BODY>
7 <H1>Scaler</H1> 7 <H1>Scaler</H1>
8 8
9 <p>A Servlet for scaling images. (Version 1.6b)</p> 9 <p>A Servlet for scaling images. (Version 1.9b)</p>
10 10
11 <h2>Web API</h2> 11 <h2>Web API</h2>
12 12
13 <p>The Scaler servlet takes parameters in the http request format: 13 <p>The Scaler servlet takes parameters in the http request format:
14 <code>Scaler/request_path/?param1=value1&param2=value2&...</code> 14 <code>Scaler/request_path/?param1=value1&param2=value2&...</code>
44 Default: 1.</li> 44 Default: 1.</li>
45 45
46 <li><b>ws</b> additional scaling factor. The resulting image will have the size 46 <li><b>ws</b> additional scaling factor. The resulting image will have the size
47 <code>[ws*dw,ws*dh]</code>. Default: 1.</li> 47 <code>[ws*dw,ws*dh]</code>. Default: 1.</li>
48 48
49 <li><b>mo</b> flags for the mode of operation separated by "+". 49 <li><b>mo</b> flags for the mode of operation separated by ",".
50 <ul> 50 <ul>
51 <li><b>fit</b>: always scale the image to fit 51 <li><b>fit</b>: always scale the image to fit
52 <code>[dw,dh]</code>.<br> <b>file</b>: send the file as-is (may 52 <code>[dw,dh]</code>.<br>
53 <b>file</b>: send the file as-is (may
53 be very large and all sorts of image types!). If configuration 54 be very large and all sorts of image types!). If configuration
54 doesn't allow sending files 55 doesn't allow sending files
55 (<code>sendfile-allowed=false</code>) revert to 56 (<code>sendfile-allowed=false</code>) revert to
56 <code>clip</code>.<br> <b>clip</b>: send the file in its 57 <code>clip</code>.<br>
58 <b>clip</b>: send the file in its
57 original resolution, cropped to fit <code>[dw,dh]</code>.<br> If 59 original resolution, cropped to fit <code>[dw,dh]</code>.<br> If
58 none of these flags is set heuristics is used (send unzoomed GIF 60 none of these flags is set heuristics is used (send unzoomed GIF
59 as-is).</li> 61 as-is).</li>
60 62
61 <li><b>errtxt</b>: send error response as HTML.<br> 63 <li><b>errtxt</b>: send error response as HTML.<br>
77 <li><b>cont</b>: change contrast of the image. Negative value 79 <li><b>cont</b>: change contrast of the image. Negative value
78 reduces contrast, positive value enhances contrast. Pixel value is 80 reduces contrast, positive value enhances contrast. Pixel value is
79 multiplied by 2^cont. Default: 0</li> 81 multiplied by 2^cont. Default: 0</li>
80 82
81 <li><b>brgt</b>: change brightness of image. Negative value reduces 83 <li><b>brgt</b>: change brightness of image. Negative value reduces
82 brightness, positive value enhances brightness. Pixel value is added 84 brightness, positive value enhances brightness. The value brgt is
83 brgt. Default: 0</li> 85 added to the pixel value. Default: 0</li>
84 86
85 <li><b>rot</b>: rotate image. Rotation angle is given in degrees. Default: 0</li> 87 <li><b>rot</b>: rotate image. Rotation angle is given in
88 degrees. Default: 0</li>
89
90 <li><b>rgbm</b>: modify color by multiplication. The contrast of the
91 red green and blue components of the image can be reduced or
92 enhanced similar to the <code>cont</code> parameter. The factors for
93 red, green and blue are separated by slashes (for example
94 0.86/0/-0.5). Default: 0/0/0</li>
95
96 <li><b>rgba</b>: modify color by addition. The brightness of the red
97 green and blue components of the image can be reduced or enhanced
98 similar to the <code>brgt</code> parameter. The factors for red,
99 green and blue are separated by slashes (for example
100 100/0/25). Default: 0/0/0</li>
86 101
87 </ul> 102 </ul>
88 The image will be scaled equally in horizontal and vertical direction such that 103 The image will be scaled equally in horizontal and vertical direction such that
89 the resulting image does not exceed the rectangle <code>[ww,wh]</code>. 104 the resulting image does not exceed the rectangle <code>[ww,wh]</code>.
90 </p> 105 </p>