6709932000-06-01Martin Nilsson <h2>Image cache attributes</h2> All examples are made for the &lt;cimg&gt; tag. <attr name='format' value='gif|jpeg|png|avs|gmp|bd|hrz|ilbm|psx|pnm|ps|pvr|tga|tiff|wbf|xbm|xpm' default='gif'> The format to encode the image to. The formats available are: <table> <tr><td>gif</td><td>Graphics Interchange Format (might be missing in your roxen)</td></tr> <tr><td>jpeg</td><td>Joint Photography Expert Group image compression</td></tr> <tr><td>png</td><td>Portable Networks Graphics</td></tr> <tr><td>avs</td><td></td></tr> <tr><td>bmp</td><td>Windows BitMaP file</td></tr> <tr><td>gd</td><td></td></tr> <tr><td>hrz</td><td>HRZ is (was?) used for amatuer radio slow-scan TV.</td></tr> <tr><td>ilbm</td><td></td></tr> <tr><td>pcx</td><td>Zsoft PCX file format (PC / DOS)</td></tr> <tr><td>pnm</td><td>Portable AnyMap</td></tr> <tr><td>ps</td><td>Adobe PostScript file</td></tr> <tr><td>pvr</td><td>Pover VR (dreamcast image)</td></tr> <tr><td>tga</td><td>TrueVision Targa (PC / DOS)</td></tr> <tr><td>tiff</td><td>Tag Image File Format</td></tr> <tr><td>wbf</td><td>WAP Bitmap File</td></tr> <tr><td>xbm</td><td>XWindows Bitmap File</td></tr> <tr><td>xpm</td><td>XWindows Pixmap File</td></tr> </table> <ex> <### format='png'/> </ex> <ex> <### format='gif'/> </ex> </attr> <attr name='quant' value='number' default='format dependant'> The number of colors to quantizize the image to. <p> Default for gif is 255(+1 transparent), for most other formats (except black and white) is it unlimited.</p> <ex> <### quant='100'/> </ex> <ex> <### quant='10'/> </ex> <ex> <### quant='2'/> </ex> </attr> <h3>Color/alpha attributes</h3> <attr name='dither' value='none|random|floyd-steinberg' default='none'> Choose the dithering method. <table> <tr><td>none</td><td>No dithering is performed at all.</td></tr> <tr><td>random</td><td>Random scatter dither. Not visually pleasing, but it is useful for very high resolution printing.</td></tr> <tr><td>floyd-steinberg</td><td>Error diffusion dithering. Usually the best dithering method.</td></tr> </table> <ex> <### dither='random' quant='10'/> </ex> <ex> <### dither='floyd-steinberg' quant='10'/> </ex> </attr> <attr name='true-alpha'> If present, render a real alpha channel instead of on/off alpha. If the file format only supports on/off alpha, the alpha channel is dithered using a floyd-steinberg dither. <ex> <### opaque-value='20'/> </ex> <ex> <### opaque-value='20' true-alpha='1'/> </ex> </attr> <attr name='background-color' value='color' default='taken from the page'> The color to render the image against. <ex> <### background-color='black' opaque-value='50'/> </ex> </attr> <attr name='opaque-value' value='percentage' default='100'> The transparency value to use, 100 is fully opaque, and 0 is fully transparent. </attr> <attr name='cs-rgb-hsv' value='0|1' default='0'> Perform rgb to hsv colorspace conversion. <ex> <### cs-rgb-hsv='1'/> </ex> </attr> <attr name='gamma' value='number' default='1.0'> Perform gamma adjustment. <ex> <### gamma='0.1'/> </ex> <ex> <### gamma='0.5'/> </ex> <ex> <### gamma='1.0'/> </ex> <ex> <### gamma='2.0'/> </ex> <ex> <### gamma='8.0'/> </ex> </attr> <attr name='cs-grey' value='0|1' default='0'> Perform rgb to greyscale colorspace conversion. <ex> <### cs-grey='1'/> </ex> </attr> <attr name='cs-invert' value='0|1' default='0'> Invert all colors <ex> <### cs-invert='1'/> </ex> </attr> <attr name='cs-hsv-rgb' value='0|1' default='0'> Perform hsv to rgb colorspace conversion. <ex> <### cs-hsv-rgb='1'/> </ex> <ex> <### cs-grey='1' cs-hsv-rgb='1' cs-rgb-hsv='1'/> </ex> <ex> <### cs-hsv-rgb='1' cs-invert='1' cs-rgb-hsv='1'/> </ex> </attr> <h3>Transform attributes</h3> <attr name='rotate-cw' value='degree' default='0'> Rotate the image clock-wise. <ex> <### rotate-cw='20'/> </ex> <ex> <### rotate-cw='90'/> </ex> </attr> <attr name='rotate-ccw' value='degree' default='0'> Rotate the image counter clock-wise. <ex> <### rotate-ccw='20'/> </ex> <ex> <### rotate-ccw='90'/> </ex> </attr> <attr name='rotate-unit' value='rad|deg|ndeg|part' default='deg'> Select the unit to use while rotating. <table> <tr><td>rad</td><td>Radians</td></tr> <tr><td>deg</td><td>Degrees</td></tr> <tr><td>ndeg</td><td>'New' degrees (400 for each full rotation)</td></tr> <tr><td>part</td><td>0 - 1.0 (1.0 == full rotation)</td></tr> </table> <ex> <### rotate-ccw='1.2' rotate-unit='rad'/> </ex> <ex> <### rotate-ccw='20' rotate-unit='deg'/> </ex> <ex> <### rotate-ccw='0.2' rotate-unit='part'/> </ex> </attr> <attr name='mirror-x' value='0|1' default='0'> Mirror the image around the X-axis. <ex> <### mirror-x='1'/> </ex> </attr> <attr name='mirror-y' value='0|1' default='0'> Mirror the image around the Y-axis. <ex> <### mirror-y='1'/> </ex> </attr> <attr name='scale' value='fact' default='1.0'> Scale fact times. (0.5 -> half size, 2.0 -> double size) <ex> <### scale='0.5'/> </ex> <ex> <### scale='1.2'/> </ex> </attr> <attr name='scale' value='x,y'> Scale to the exact size x,y. If either of X or Y is zero, the image is scaled to the specified width or hight, and the value that is zero is scaled in proportion to the other value. <ex> <### scale='10,40'/> </ex> <ex> <### scale='100,0'/> </ex> <ex> <### scale='0,10'/> </ex> <ex> <### scale='100,10'/> </ex> </attr> <attr name='max-width' value='xsize'> If width is larger than 'xsize', scale width to 'xsize' while keeping aspect. <ex> <### max-width='300'/> </ex> <ex> <### max-width='100'/> </ex> </attr> <attr name='max-height' value='ysize'> If width is larger than 'ysize', scale width to 'ysize' while keeping aspect. <ex> <### max-height='300'/> </ex> <ex> <### max-height='30'/> </ex> </attr> <attr name='x-offset' value='pixels' default='0'> Cut n pixels from the beginning of the X scale. <ex> <### x-offset='10'/> </ex> <ex> <### x-offset='50'/> </ex> </attr> <attr name='y-offset' value='pixels' default='0'> Cut n pixels from the beginning of the Y scale. <ex> <### y-offset='10'/> </ex> <ex> <### y-offset='30'/> </ex> </attr> <attr name='x-size' value='pixels' default='whole image'> Keep n pixels from the beginning of the X scale. <ex> <### x-size='100'/> </ex> </attr> <attr name='y-size' value='pixels' default='whole image'> Keep n pixels from the beginning of the Y scale. <ex> <### y-size='30'/> </ex> <ex> <### y-size='100'/> </ex> </attr> <attr name=crop value='x0,y0-x1,y1' default='whole image'> Crop the image by specifying the pixel coordinates. <ex> <### crop='50,00-150,20'/> </ex> <ex> <### crop='50,28-150,92'/> </ex> <ex> <### crop='0,0-200,20'/> </ex> <ex> <### crop='0,28-200,92'/> </ex> </attr> <h3>Format specific attributes</h3> <attr name='jpeg-quality' value='percentage' default='75'> Set the quality on the output jpeg image. <ex> <### format='jpeg' jpeg-quality='100'/> </ex> <ex> <### format='jpeg' jpeg-quality='30'/> </ex> <ex> <### format='jpeg' jpeg-quality='1'/> </ex> </attr> <attr name='jpeg-optimize' value='0|1' default='1'> If 0, do not generate optimal tables. Somewhat faster, but produces bigger files. </attr> <attr name='jpeg-progressive=' value='0|1' default='0'> Generate progressive jpeg images. </attr> <attr name='jpeg-smooth' value='0-100' default='0'> Smooth the image while compressing it. This produces smaller files, but might undo the effects of dithering. <ex> <### format='jpeg' jpeg-quality='10' jpeg-smooth='0'/> </ex> <ex> <### format='jpeg' jpeg-quality='10' jpeg-smooth='100'/> </ex> </attr> <attr name='bmp-bpp' value='1,4,8,24' default='24'> Force this number of bits per pixel for bmp images. </attr> <attr name='bmp-windows' value='0|1' default='1'> Windows or OS/2 mode, default is 1. (windows mode) </attr> <attr name='bmp-rle' value='0|1' default='0'> RLE 'compress' the BMP image. </attr> <attr name='gd-alpha_index' value='color' default='0'> Color in the colormap to make transparent for GD-images with alpha channel. </attr> <attr name='pcx-raw' value='1|0' default='0'> If 1, do not RLE encode the PCX image. </attr> <attr name='pcx-dpy' value='0-10000000.0' default='75.0'> Resolution, in pixels per inch. </attr> <attr name='pcx-xdpy' value='0-10000000.0' default='75.0'> Resolution, in pixels per inch. </attr> <attr name='pcx-ydpy' value='0-10000000.0' default='75. Resolution, in pixels per inch. </attr> <attr name='pcx-xoffset' value='0-imagexsize-2' default='0'> Offset from start of image data to image content for PCX images. Unused by most programs. </attr> <attr name='pcx-yoffset' value='0-imageysize-2' default='0'> Offset from start of image data to image content for PCX images. Unused by most programs. </attr> <attr name='tga-raw' value='1|0' default='0'> If 1, do not RLE encode the Targa image. </attr> <attr name='ps-dpi' value='0-10000000.0' default='75.0'> Dots per inch for the resulting postscript file. </attr>>