Inkscape

zoom bug

Bug #1362727 reported by Andreas Pernlund on 2014-08-28

This bug report is a duplicate of: Bug #170356: Provide per-object antialiasing control (SVG 1.1 shape-rendering property). Edit Remove

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	Inkscape	New	Undecided	Unassigned

Bug Description

I'm experiencing a problem when I zoom in the canvas. In some cases, appears a thin white line of pixels (or what ever color the background is) between two objects eg two squares even though I have centered them and put them edge to edge.

Kind regards from Sweden

Andreas

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Andreas Pernlund (andreas-pernlund) wrote on 2014-08-28:

example image Edit (60.6 KiB, image/png)

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su_v (suv-lp) wrote on 2014-08-28:

Please always provide information about OS/platform and Inkscape version (see Inkscape menu 'Help > About Inkscape') when filing bug reports.

A screenshot or exported PNG image without the actual SVG file used to produce the rasterized images does not provide information which would allow to further investigate the reported issue - although based on the bug description, the issue reported here (bug #1362727) matches a well-known antialiasing issue of adjacent object boundaries already tracked in
- Bug #170356 (sf1003049) “Provide per-object antialiasing control (SVG 1.1 shape-rendering property)”
<https://bugs.launchpad.net/inkscape/+bug/170356>
and several duplicate reports.

Could you please attach the original SVG file used to produce "bitmap.png" (and details about the export settings in case the PNG was generated with 'File > Export Bitmap')?

Changed in inkscape:
status:	New → Incomplete

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Andreas Pernlund (andreas-pernlund) wrote on 2014-08-28:

Symbol.zip Edit (116.0 KiB, application/zip)

Yes of course I´m sorry

I am currently using Windows 7 Home Premium 64-bit and the 0.48.5 version of Inkscape.

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su_v (suv-lp) wrote on 2014-08-28:

Thanks for the feedback - the reported issue is due to the mentioned antialiasing effect at object boundaries against transparent background: this happens during rendering whenever an object's boundary doesn't fall on a pixelgrid line (on export the pixelgrid of the rasterized bitmap, depends on resolution; in the document window depending on the position of the objects and zoom level).

For horizontal and vertical edges, this can be minimized by aligning such edges to the pixelgrid of the drawing (see 'View > Display > Grid') and exporting at the native resolution of 90dpi (or viewing at 100% zoom level on-canvas). For diagonal or curved adjacent object boundaries, there is no such workaround - visible gaps can be avoided or minimized by slightly overlapping the shapes (e.g. by adding a stroke of the same color), if the drawing content allows for such slight "imprecision", or by stacking a unioned copy of the adjacent shapes underneath, with a fill color which is closer to the colors of the individual shapes than the usual background.

Linking as duplicate to bug #170356.