Opened 16 years ago

Closed 15 years ago

Last modified 13 years ago

#213 closed enhancement (fixed)

Display Raster Image at 100%

Reported by: gregcoats@… Owned by: homann
Priority: major: does not work as expected Milestone:
Component: Rasters Version:
Keywords: Cc:
Must Fix for Release: No Platform: OS X
Platform Version: Mac OS X Awaiting user input: no


When working with raster images, it is necessary to be able to display them at their native resolution, meaning displaying a raster image such that one pixel in the image occupies exactly one pixel on the screen. Adobe Photoshop calls this 100%. Apparently, Qgis does not currently provide this capability. The two benefits of offering this capability are that 1. raster images can be displayed much faster and 2. raster images won't be displayed appearing as though they have been squeezed through for a low quality resizing algorithm optimized for speed, instead of for appearance. As a corollary to this, it is then highly desirable to be able to zoom in by 2, and zoom out by 2. Again, these will be very fast operations for raster images, and especially useful when working with a series of GeoTIF images arranged to form an image pyramid, plus this is useful with all GeoJPEG2000, which by the nature of JPEG2000 structure, always include an image pyramid. When display raster images at 100%, the computer has less to do, so the display is faster, and 100% yields a better looking image. Greg Coats

Change History (3)

comment:1 by homann, 15 years ago

Must Fix for Release: No
Owner: changed from timlinux to homann
Status: newassigned

comment:2 by homann, 15 years ago

Resolution: fixed
Status: assignedclosed

Added this in r6735.

comment:3 by (none), 13 years ago

Milestone: Version 0.9

Milestone Version 0.9 deleted

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