CompuServe Thread

AAS Dithering

5 messages in this thread
#180864From: James SweetingJul 19, 1995 7:43 AM
When I try to save out a flc in AAS using the to bitmaps palette check box I get strange interlacing lines sometimes when I check the dither option – undithered is OK. I have already sent you a bug report (via compuserve) which you haven't replied to I even sent some GIF file examples Can you help?
#182047From: david W. mennenohJul 25, 1995 6:19 PM
James, The shimmering areas your referring to are the result of dithering. As you've noticed. This will happen anytime you use dithering with a flc. Especially apparent in gradients. It happens because each image is treated indepently and dithered differently. You just need to not dither. No bug…. DM
#182435From: James SweetingJul 27, 1995 7:14 AM
Yeah thanks, I do know what dithering is – have you ever seen a dithing algerithm that introduces horizontal lines?
#182200From: Brian Rudolph [Adesk]Jul 26, 1995 11:25 AM
James, I've asked one of the other sysops who better know AAS to respond to your dithering problem. My question is which CIS ID# did you send the bug report to? Or did you upload it to the library? I want to make sure we track that down. -Brian
#182310From: Nik Grant [adesk]Jul 26, 1995 5:16 PM
"When I try to save out a flc in AAS using the to bitmaps palette check box I get strange interlacing lines sometimes when I check the dither option – undithered is OK. I have already sent you a bug report (via compuserve) which you haven't replied to I even sent some GIF file examples Can you help?" I am afraid that after checking we still cannot find your earlier bug report (hopefully it went straight to QA and that's why we can't find it). And the GIF examples? A bug has been written up that sounds like your problem, however. It has to do with the changes made to the colors after the file is saved as a flic. For instance, if I load a new, 1 frame 320×200 flic,it has a white background. Using the eyedropper from the toolbar, I see that the value is 255,255,255 for the rgb values. If I save as a 256 color flic (dithering option can be on or off), the flic file now on the screen shows 254,254,254. I believe that saving as a flic is incorrectly reducing the colors. Unfortunately, in this case, it's reproducible in c1, so do not expect to see your problem go away with c1. If you think that the bug I'm referring to does not adequately answer your concerns (in other words, fixing my bug won't fix yours) then would you mind resubmitting the bug? Autodesk (Product Support or QA) should reply to you with a minimum, "Yes, we received your bug report and files." I'll check with QA to see if it arrived there.