Re: [Jmol-users] png files created in jsmol

[Rolf H. <Rol...@le...>]

Am 22.07.17 um 10:04 schrieb João Palhoto Matos:
> Hello!
>
> I use jmol inside SageMath which I build from source. Currently this is
> Sage 7.6 which comes with  jmol-14.6.1_2016.07.11 from which it uses
> jsmol. When producing a 3d graphic one has the option of saving or
> exporting files in various formats from a context menu. One of them is
> PNG files, namely "export PNG image". The files produced in this manner
> fail to pass testing with the pngcheck utility. Opening the file with
> gimp and exporting to png format one ends up with a smaller file without
> apparent image quality loss which is considered OK by pngcheck. Is this
> intended behavior and the file getting some extra information, or some bug?
>
It is a special Jmol feature. As default, images saved in PNG format are 
actually saved in PNGJ format (see 
https://chemapps.stolaf.edu/jmol/docs/#writeimagesandframes). This means 
everything needed to get back the 3D model in the representation shown 
in the image is included.

You can easily check this by opening the image in Jmol/JSmol.

This behaviour can be switched off by the command 'set imageState off' 
and back on by 'set imageState on'.

Regards,
Rolf