Difference between revisions of "Png"

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(DPI Setting: updated to account for integrated width, height, and ray arguments)
(example, remove obsolete "blank screen" comment)
 
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'''png''' writes a png format image file of the current image to disk.
 
'''png''' writes a png format image file of the current image to disk.
  
===USAGE===
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== Usage ==
 
  png filename[, width[, height[, dpi[, ray[, quiet]]]]]
 
  png filename[, width[, height[, dpi[, ray[, quiet]]]]]
  
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* '''quiet''' = 0 or 1: if 1, logged output is suppressed.  {default: 0}
 
* '''quiet''' = 0 or 1: if 1, logged output is suppressed.  {default: 0}
  
===PYMOL API===
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== Example ==
 +
 
 +
png ~/Desktop/test.png, width=10cm, dpi=300, ray=1
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== PyMOL API ==
 
<source lang="python">
 
<source lang="python">
 
cmd.png(string filename, int width=0, int height=0, float dpi=-1, int ray=0, int quiet=0)
 
cmd.png(string filename, int width=0, int height=0, float dpi=-1, int ray=0, int quiet=0)
 
</source>
 
</source>
  
===COMMENTS===
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== Comments ==
 
 
====Blank Screen Shots====
 
If, when you execute the [[Png]] command, you get blank images, you may have to [[Ray]] trace your image first, before running the [[Png]] command.  This occurs when there is no device context for the image, such as when running PyMOL in quiet gui-less mode.  If the ray tracing is taking too long due to scene complexity or size, then please see the [[Ray]] page or search the wiki for information about making movies with PyMOL (there are many ways to [[:Category:Performance|speed]] up rendering).
 
  
 
====Transparent Backgrounds====
 
====Transparent Backgrounds====
See [[Ray_opaque_background]].  This is very useful for presentations, or images that are placed on top of a background of nonuniform color, or if you simply want a transparent background for your images.
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Use the `[[ray_opaque_background]]` setting to output images with transparent backgrounds.
 +
  set ray_opaque_background, 0
 +
This can be useful for presentations, images that are placed on top of a background of nonuniform color (e.g. gradients), and images that overlap text or other images.
  
 
====DPI Setting====
 
====DPI Setting====

Latest revision as of 12:31, 9 February 2015

png writes a png format image file of the current image to disk.

Usage

png filename[, width[, height[, dpi[, ray[, quiet]]]]]
  • filename = string: file path to be written
  • width = integer or string: width in pixels (integer or string without units), inches (in), or centimeters (cm). If unit suffix is given, `dpi` argument is required as well. If only one of `width` or `height` is given, the aspect ratio of the viewport is preserved. {default: 0 (current)}
  • height = integer or string: height (see width) {default: 0 (current)}
  • dpi = float: dots-per-inch {default -1.0 (unspecified)}
  • ray = 0 or 1: should ray be run first {default: 0 (no)}
  • quiet = 0 or 1: if 1, logged output is suppressed. {default: 0}

Example

png ~/Desktop/test.png, width=10cm, dpi=300, ray=1

PyMOL API

cmd.png(string filename, int width=0, int height=0, float dpi=-1, int ray=0, int quiet=0)

Comments

Transparent Backgrounds

Use the `ray_opaque_background` setting to output images with transparent backgrounds.

set ray_opaque_background, 0

This can be useful for presentations, images that are placed on top of a background of nonuniform color (e.g. gradients), and images that overlap text or other images.

DPI Setting

Use the DPI option to have PyMol set the DPI of your image. Executing the command

png /tmp/ex.png, width=1200, height=1200, dpi=300, ray=1

will ouput a four-inch square image at 300dpi. Leaving off the dpi parameter would yield a 1200x1200 image at your system's default pixel density (e.g. 72 or 96 dpi). This saves the intermediate step of having to use GIMP/PhotoShop/etc to rescale your photos for publication.