diff options
Diffstat (limited to 'pnmtopng.html')
| -rw-r--r-- | pnmtopng.html | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/pnmtopng.html b/pnmtopng.html index 8536c5e4..5067dd63 100644 --- a/pnmtopng.html +++ b/pnmtopng.html @@ -145,12 +145,14 @@ command line options: <dd> This causes <b>pnmtopng</b> to display information about the format of the output file. +<p> <dt><b>-downscale</b> <dd> This enables <b>pnmtopng</b> to scale maxvalues of more then 65535 to 16 bits. Since this means loss of image data, <b>pnmtopng</b> does not do it by default. +<p> <dt><b>-interlace</b> <dd> @@ -168,6 +170,7 @@ top, so the displayer could display each row of the image as it arrives and gradually paint down to the bottom. But with an interlaced image, the displayer can start by showing a low-resolution version of the image, then gradually improve the display as more data arrives. +<p> <dt><b>-alpha=</b><i>filename</i> @@ -179,6 +182,7 @@ in the PNG format. If it can represent the transparency information through a palette, it will do so in order to make a smaller PNG file. <b>pnmtopng</b> even sorts the palette so it can omit the opaque colors from the transparency part of the palette and save space for the palette. +<p> <dt><b>-transparent=</b><i>color</i> <dd> @@ -212,6 +216,7 @@ color does not appear in the image, there will be no transparency. Causes <b>pnmtopng</b> to create a background color chunk in the PNG output which can be used for subsequent transparency channel or transparent color conversions. Specify <i>color</i> the same as for <b>-transparent</b>. +<p> <dt><b>-palette=</b><i>palettefile</i> @@ -250,11 +255,13 @@ case of this is when the image is created by simple hardware that doesn't have digital computational ability. Also, some simple programs that generate images from scratch do it with a gamma transfer in which the gamma value is 1.0. +<p> <dt><b>-hist</b> <dd>Use this parameter to create a chunk that specifies the frequency (or histogram) of the colors in the image. +<p> <dt><b>-text=</b><i>filename</i> @@ -262,6 +269,7 @@ images from scratch do it with a gamma transfer in which the gamma value is This option lets you include arbitrary text strings in the PNG output, as tEXt chunks. +<p> <i>filename</i> is the name of a file that contains your text strings. <p>The output contains a distinct tEXt chunk for each entry in the file. @@ -302,7 +310,7 @@ key for the text string starts with "A" or "T". This odd exception exists for backward compatibility; we don't know why the program was originally designed this way, except that the distinction was meant to roughly identify the keys "Author" and "Title". - +<p> <dt><b>-rgb=</b><i>chroma_list</i> @@ -482,7 +490,7 @@ resulting PNG output is as similar to the Netpbm input as possible. For example, the PNG output will not be paletted and the transparency channel will be represented as a full transparency channel even if the information could be represented more succinctly with a transparency chunk. - +<p> <dt><b>-libversion</b> |