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- Hi,
-
- I have downloaded Executor/DOS 1.99k and began to evaluate it. 1.99k is
- somewhat better than the previous versions, but I noticed that handling
- of CLUT by NIH Image 1.55 is still problematic. What I found are:
-
- 1) When NIH Image runs on genuine Mac, the CLUT window shows a smooth,
- borderless gray scale unless I open an image whose CLUT is not 8-bit gray
- scale or I load new CLUT. In contrast, from the beginning it displays
- stepwise (16 levels) gray scale, that I don't expect, under Executor/DOS
- 1.99k.
-
- 2) When I open new image of 8-bit gray scale, it seems to have correct CLUT
- at first. However, once NIH Image redraws the image (e.g., moving another
- window onto the image and then removing it, or dragging the image out of
- scope of the CRT and restoring the location), the quantization levels of
- the image becomes to look like only 4 bit(i.e., 16 levels).
-
- I have confirmed reproducibility of this phenomenon using various video
- cards including S3-864, Cirrus Logic GD5426/8, etc. So, I don't think
- this is due to a bug of some particular video driver but insufficient
- compatibility of Executor/DOS for fully emulating *genuine* Quick Draw
- routines. I hope Ardi could ensure the full functionality (except for
- hardware-dependent functions such as image acquisition by frame grabbers)
- of NIH Image in Executor v2.0, since anyone can get full source codes of
- NIH Image freely and thus Ardi can have the opportunity to examine them
- in detail.
-
- Thanks,
-
- ---
- raraki(Ryuichiro Araki)
- raraki@human.waseda.ac.jp
-
-