Talk:Hold-and-Modify

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Merge with what now?

The description of the control bits is wrong. I believe 01 changes the blue component and 11 changes the green component.

[edit] Aspect ratio

I remember creating some HAM graphics with a Photoshop export plug-in. It seemed HAM used a very wide pixel ratio. What was the screen resolution of HAM images?

The screen resolution was LoRes or LoRes-Laced. In PAL areas, this was 320x256 or 320x512. In NTSC areas, this was 320x200 or 320x400. HiRes (640 width) didn't support HAM, at least not on OCS/ECS Amigas, I believe that the AGA Amigas could do this though (I never had one, so can't be certain).

--193.120.178.201 16:46, 26 July 2006 (UTC)

AGA did allow HAM mode to be used on 70ns (HiRes) and 35ns (SuperHiRes and Productivity) resolutions. --Safalra 16:20, 19 December 2006 (UTC)

OCS and ECS did not have the bandwidth to support fetching more than 4 bitplanes in Hires mode, hence they could not support HAM in Hires or higher. AGA could display all 8 bitplanes in all modes, thus it could display HAM in any mode. 62.31.67.29 15:57, 16 February 2007 (UTC)

[edit] lossy compression?

I would say it's more quantisation than lossy compression. What do people think? 62.31.67.29 15:57, 16 February 2007 (UTC)

Isn't all computer graphics quantisation? I think that "lossy compression" is a better term. Val42 19:39, 17 February 2007 (UTC)