[chimerax-users] Colors from snapshots

[Christophe Leterrier]

Hi,

After properly testing viewer vs supersample 3 vs supersample 1, (see
screenshot attached from left to right), I can say that the color
desaturation problem does still not come from the supersampling. non
supersampled (supersample 1) is as desaturated as supersampled 3.

[image: viewer_ss3_ss1.png]

On Tue, 28 Jan 2020 at 19:22, Eric Pettersen <pett at cgl.ucsf.edu> wrote:

> 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> 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> 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
>> > <viewer_vs_snapshot.png>_______________________________________________
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>>
>> <viewer_nonsss_ss3.png>_______________________________________________
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