#26827 Nov 26, 2006
I've done some websurfing and discovered to my surprise that
many modern computer monitors are 6-bit (ie 64 levels) rather than
8-bit (256 levels). This amazes me. I thought they were all 8-bit.
My rather new Dell widescreen LCD monitor (2405FPW) turns out to be a
true 8-bit monitor. Perhaps my older monitor was a 6-bit one (at
least it wasn't a 2-bit old monitor :-)). Here's a list of Dell
My previous monitor was a ViewSonic. I haven't tracked down its specs
So, perhaps Doug has simply programmed MaximDL at the 6-bit level for
speed. Doug: Is that what it is?
Also, I made my own 256 graylevel ramp, pasted it into IrfanView, and
saved in in tif, png, and jpg formats. For the tif and png formats,
IrfanView dropped it down from 8-bit to 6-bit. Same for jpg although
for that one the jpg artifacts further complicate the story. Anyway,
at least MaximDL saves an 8-bit file as an 8-bit file even if it
doesn't display it as such.
--- In MaxImDL@yahoogroups.co
> They both look to be 8 bit grey scale depth to me. I'm on V4.52.
#26829 Nov 26, 2006
The problem wasn't IfranView. The image that I pasted into IrfanView
was generated by Matlab and I now see that Matlab also works at the
6-bit level. So, I went to Photoshop and made a grayscale ramp that
really has 8-bit depth. I saved it as a png file. I loaded the png
file into MaximDL and discovered that Photoshop does give a true 8-bit
ramp but even they are sneaky. They dither the ramp slightly to give
the visual impression of even more than 8-bit depth. So, in MaximDL,
I applied a 3x3 median filter to remove the dither. In that way I
have made a true 8-bit grayscale ramp. I've posted it here...
If this ramp looks the same to you in MaximDL as in a web browser,
then I would conjecture that you have a 6-bit monitor. If the browser
version looks better, then you have an 8-bit monitor. On my Dell
monitor, the difference is significant.