[chimerax-users] Colors from snapshots

[Eric Pettersen]

Unfortunately, supersampling defaults to 3, so the “non-supersampling” command actually needs to be:  save myimage.png supersample 1

—Eric

	Eric Pettersen
	UCSF Computer Graphics Lab



> On Jan 28, 2020, at 10:12 AM, Christophe Leterrier <christophe.leterrier at gmail.com> wrote:
> 
> Hi Tom,
> 
> thank you for your reply. I don't think it's due to supersampling. In the attached screenshot you see form left to right; viewer, no supersampling (save /Users/christo/Desktop/image1.png) and default supersampling (save /Users/christo/Desktop/image2.png supersample 3). The viewer is more contrasted and more saturated that both the non-supersampled and the supersampled images, that look identical. By the way this is on my MacBook Pro whereas the previous one was from iMac (both Retina though).
> 
> Christophe
> 
> On Tue, 28 Jan 2020 at 18:24, Tom Goddard <goddard at sonic.net <mailto:goddard at sonic.net>> wrote:
> Hi Christophe,
> 
>   I guess you are saving the image with the Snapshot icon on the toolbar.  The equivalent command is shown in the Log panel
> 
>         save /Users/goddard/Desktop/image1.png supersample 3
> 
> It is probably the "supersample 3" option that is fading your colors.  That option says make the image 3 times bigger and then average over 3 x 3 pixel bins to obtain smoother edges.  If instead you use
> 
>         save myimage.png
> 
> I believe you will get identical colors to those you see on the screen.
> 
>   Maybe I should add some snapshot options to the preferences panel and I could let you choose whether you want supersampling.  On a Mac retina display the snapshot icon makes an image with half the resolution shown on the screen -- could also have an option to up the resolution.  Probably better to just fix it so it uses the screen resolution.
> 
>         Tom
> 
> 
> 
> > On Jan 28, 2020, at 8:12 AM, Christophe Leterrier <christophe.leterrier at gmail.com <mailto:christophe.leterrier at gmail.com>> wrote:
> > 
> > Hi,
> > 
> > I wonder why the colors in the snapshots (and movies) from ChimeraX are always washed-out compared to the colors I get live in the viewer. Attached is a screenshot with the viewer on the left, the corresponding snapshot on the right: one can see how the snapshot is desaturated compared to the viewer. From my limited tests it is the case when saving as both PNG and PPM, and I wonder if this could be corrected. I could saturate the screenshots afterward but it doesn't seem right to me to grossly mess with color levels post-hoc given how stunning the shaded rendering from ChimeraX are.
> > 
> > Thanks,
> > 
> > Christophe
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