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1.99k & NIH Image
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