diff options
| author | scuri <scuri> | 2008-10-17 06:10:15 +0000 |
|---|---|---|
| committer | scuri <scuri> | 2008-10-17 06:10:15 +0000 |
| commit | 5a422aba704c375a307a902bafe658342e209906 (patch) | |
| tree | 5005011e086bb863d8fb587ad3319bbec59b2447 /html/en/storage.html | |
First commit - moving from LuaForge to SourceForge
Diffstat (limited to 'html/en/storage.html')
| -rw-r--r-- | html/en/storage.html | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/html/en/storage.html b/html/en/storage.html new file mode 100644 index 0000000..138d539 --- /dev/null +++ b/html/en/storage.html @@ -0,0 +1,72 @@ +<html> + +<head> +<meta http-equiv="Content-Language" content="en-us"> +<meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"> +<title>Storage</title> +<link rel="stylesheet" type="text/css" href="../style.css"> +</head> + +<body> + +<h1>Storage Overview</h1> + + <p>Essentially all the file formats save the same image data. There is no such + thing like a GIF image, instead we have a color indexed image that can be + saved in a file with a GIF format, or a TIFF format, etc. However the + compression encoding can be lossy and degrade the original image. The point is + file formats and image data are two different things.</p> + <p>A file format is a file organization of the image data and its attributes. + The IM library model considers all the file formats under the same model, + including image, video, animation, stacks and volume file formats. When there + is more than one image each one is treated as an independent frame. Each frame + can have its own parameters and set of attributes.</p> + <p>The abstract model we use has the following structure:</p> + <div align="center"> + <center> + <table border="1" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="300" id="AutoNumber1" cellpadding="3"> + <tr> + <td align="center" bgcolor="#C0C0C0"><b>Format Identifier</b></td> + </tr> + <tr> + <td align="center" bgcolor="#C0C0C0"><b>Compression</b></td> + </tr> + <tr> + <td align="center" bgcolor="#C0C0C0"><b>Image Count</b></td> + </tr> + <tr> + <td align="center" style="border-top-style: solid; border-top-width: 1" bgcolor="#FFFF99"> + Image Information:<br> + parameters, attributes, palette</td> + </tr> + <tr> + <td align="center" bgcolor="#FFFF99">Image Data</td> + </tr> + <tr> + <td align="center" bgcolor="#FFFFCC">Image Information:<br> + parameters, attributes, palette</td> + </tr> + <tr> + <td align="center" bgcolor="#FFFFCC">Image Data</td> + </tr> + <tr> + <td align="center" bgcolor="#FFFF99">...</td> + </tr> + </table> + </center> + </div> + <p>The compression is usually the same for all the images in the file, but it + can be changed after loading an image. For tradicional file formats image + count is always 1. Image information must always be loaded or saved before + image data.</p> + <p>We consider only formats that starts with a signature so we can recognize + the format without using its file extension. If there is more than one driver + that handles the same signature the first registered driver will open the + file. Since the internal drivers are automatically registered all the external + drivers can be loaded first if no <b>imFile</b> function has been called. In + this way you can also control which external driver goes first.</p> + + +</body> + +</html> |