[Chimera-users] How to save high resolution image?

Greg Couch gregc at cgl.ucsf.edu
Thu Apr 19 11:46:17 PDT 2012

Hi Yogendra,

The images that Chimera generates with POV-Ray have the right number of 
pixels for the DPI and image size you selected, but POV-Ray doesn't save 
the DPI setting in the file.  Since the DPI value is missing from the 
file, your computer displays it with your screen's resolution.  So in 
your case, not only is the DPI different from what you expected, but the 
image size is different as well.  To store the DPI in the file, you 
would need to use another program to fix the file, like Adobe PhotoShop 
or GNU gimp.  I will keep the bug open with a request to fix up the 
POV-Ray output, but you already have the right number of pixels in your 

     -- Greg

On 04/19/2012 10:35 AM, Eric Pettersen wrote:
> As far as I can tell, POV-ray images don't have the DPI setting 
> specified in the Chimera interface.  Always seems to be the screen 
> DPI.  There is a ticket for this problem now:
> #10683 (POV-ray not honoring DPI setting) -- Chimera 
> <https://plato.cgl.ucsf.edu/trac/chimera/ticket/10683%23comment:1>
> However, non-POV-ray images have the right DPI.
> --Eric
>                         Eric Pettersen
>                         UCSF Computer Graphics Lab
> http://www.cgl.ucsf.edu
> On Apr 19, 2012, at 9:12 AM, Elaine Meng wrote:
>> Hi Yogendra,
>> In the "File... Save Image" dialog, if you want to enter "dpi" you 
>> need to turn on "Use print units".  Then you can specify a "Print 
>> resolution(dpi)" value, and image width and height in units of length 
>> (for example, inches) instead of pixels.
>> Please send questions to the chimera-users address only (not the 
>> chimera-bugs address).
>> Thanks,
>> Elaine
>> ----------
>> Elaine C. Meng, Ph.D.
>> UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab
>> Department of Pharmaceutical Chemistry
>> University of California, San Francisco
>> On Apr 18, 2012, at 10:37 PM, Yogendra wrote:
>>> Dear Sir,
>>> I am a new user of Chimera software. I am using this software for 
>>> academic
>>> purposes (i.e. research publications). I am trying to save the image 
>>> with more
>>> then 600 dpi but every time i am ending up with an image of 96 dpi. 
>>> I am using
>>> the POV-Ray method for image improvement but everything is going to 
>>> the drain
>>> when taking the final print of the document. Can you please help me 
>>> ho can i
>>> save a high resolution image? I am briefly describing my protocol of 
>>> image
>>> generation:
>>> 1) I am making a density map of particular PDB file.
>>> 2) loading in the Chimera and adjusting the volume by volume viewer 
>>> option
>>> 3) Coloring it using described colors
>>> 4) Using Pov-Ray for increasing effects on plane
>>> 5) Increasing the pixels to about 5000 in the pixel option
>>> 6) finally trying to save an image with 600 or 1200 dpi.
>>> But at the end of this, i am just getting an image of 96 dpi every 
>>> time. Can you
>>> please help me out to make an image of higher dpi (600, 1200 or more if
>>> possible).
>>> It will be very much helpful for me if can do it. I am stuck at this 
>>> point.I am
>>> badly waiting for your reply whether i can do it or should i look 
>>> for some
>>> another software.
>>> Regards
>>> Yogendra S Rathore
>>> Research Scholar
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