home *** CD-ROM | disk | FTP | other *** search
- ChangeFSI is a high quality image mastering program which understands many
- image formats. The image may be scaled, rotated by 90 degrees and sharpened.
- Images can be made for any RISC OS screen mode in monochrome, greyscale or
- colour. Various image processing algorithms can be applied to the image.
-
- You (the operator) set up the program's options using the menus and dialogue
- boxes and then drop the source image file onto ChangeFSI's icon. The picture
- will be computed (sometimes this takes a long time) and displayed for you to
- see and save.
-
- The document FSIinfo contains full information on the program. Brief
- information is shown below.
-
- The Scaling dialogue box allows choice of the scaling options.
- =======
-
- "Ignore Source Pixel Size" stops the program believing those image formats
- which provide the pixel size (useful especially if the information is
- wrong!). The pixels are all considered to be square and the same size as a
- mode 27 pixel (2 OS units per side).
-
- "Ignore pixel aspect" completely disables all the size information in the
- program. Both source and output pixels are considered to be square.
-
- "Lock picture aspect" prevents "Scale to fill" or "Custom" scaling changing
- the aspect ratio of the picture: it will be small enough to fit in the
- specified space.
-
- "Scale to fill" will provide a full screen sprite for the current mode.
-
- The "Custom" box allows for different scaling. Enter x ratio and y ratio in
- the boxes below (default 1/4 in both axes) and turn the option on to use it.
- If the righthand boxes are zero (empty), the lefthand boxes specify the size
- of the final output.
-
- The Processing dialogue box controls the image processing algorithms.
- ==========
-
- "Expand Dynamic Range" will read the picture to discover how much of the
- 0-fullscale it actually uses and expand it to the full range.
-
- "Disable Dithering" turns off the dithering: picture quality drops!
-
- "Brighten Picture" causes ChangeFSI to produce a picture that is 16/15
- brighter than it should be. In the case of light pictures this can produce
- objectionable white patches.
-
- "Pre-Sharpening" can be used either to actually sharpen an image (with
- values in the range 10 to 20) or to compensate for the "fuzzyness"
- introduced by dithering (values in the range 20 to 30).
-
- The Output dialogue box controls the mode the picture is created for.
- ======
-
- "1,2,4,8,16,32" These radio buttons represent square pixel modes (e.g. VGA)
- "1,2,4,8,16,32" and TV standard modes (like mode 12) with "n" bits per pixel.
- The selected mode is shown in the box to their right and this can also be
- typed into for any specific mode. *NOTES* if the "Use current mode" option
- is ON, then these boxes will be difficult to change... 16 and 32 bit output
- on the desktop is only possible with a suitable OS.
-
- "Use current mode" (the default) will make the picture for the current
- screen mode - change desktop mode to change the target mode.
-
- "Monochrome" the output is made into 1, 4, 8 or 16 greys for 1, 2, 4 and
- 8 bit per pixel modes respectively.
-
- "Colour" (the default) the output is made using all the colours available
- (this isn't very many for 1 and 2 bit per pixel modes!).
-
- "Special" allows the choice of any of the "mode suffixes" described in the
- FSIinfo document (see the end).
-
-
- The !Run file is set up for colour pictures of around 3000 pixels across
- maximum, monochrome pictures of around 9000 pixels across maximum. You will
- need to increase the slot size for larger pictures.
-
-
- ChangeFSI$Cache can be set to values larger than 128K to speed processing.
- (In particular, JPEG files smaller than the value of ChangeFSI$Cache will
- be read much quicker).
-
- ChangeFSI$PCDIndex can be set to change which PhotoCD resolution is read.
-