Dec 122017
 
Will convert un-compressed TIF files to GIF format.
File TIF2GIF.ZIP from The Programmer’s Corner in
Category Printer + Display Graphics
Will convert un-compressed TIF files to GIF format.
File Name File Size Zip Size Zip Type
TIF2GIF.DOC 1527 846 deflated
TIF2GIF.EXE 19568 10696 deflated

Download File TIF2GIF.ZIP Here

Contents of the TIF2GIF.DOC file


TIF2GIF is a program which converts TIFF-G uncompressed (4 or 8
bits/pixel) monochrome image files to GIF image files. It is not robust
in the TIF formats it will accept; I wrote it for the two cases I
needed. I am open to suggestions on additional TIFF variations to support.

You have the option if stretching the image in the X direction, making
the resulting file more suitable for the benighted non-square pixels of
a CGA, EGA or Hercules display board.

If the same number of bits is used for the GIF file, no dithering is
used. Otherwise, you have a choice of Floyd-Steinberg or Stucki
dithering. FS is quick, and gives reasonable results. Stucki will give
better detailing, at the expense of some time.

For multi-bit output, the dithering uses gray-levels, and a "color"
table is written to the file for use by display programs. Try using 3
bits on a VGA, or 2 bits for an EGA. ( Be wary of some VGA programs
which do not set color tables correctly! For example, CSHOW5 only allows
4 shades per primary, just like an EGA.) Most EGA/VGA monitors/cards I have
seen have a disproportionally bright "full white", which gives poor
results, though you could try adjusting the contrast & brightness. The
IBM 8514, for those of you with $, looks wonderful with 4 bits. I
have added an option (for Stucki dithering only) to disuse the brightest
level, which helps EGAs with the above problem considerably.

Please direct comments/complaints to me, CompuServe 7377,1761.
.. Steve



 December 12, 2017  Add comments

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