411023 - Results of lighting filter are brighter than the reference image; lighting depends on zoom level

Status: RESOLVED INVALID

(Core :: SVG, defect)

Description

[Steffen Wilberg]

From bug 383184 comment 27:

These two look different, the reference image doesn't have so much light on it:
http://www.w3.org/TR/SVG/images/filters/filters01.png
http://www.w3.org/TR/SVG/images/filters/filters01.svg
That's from http://www.w3.org/TR/SVG/filters.html#AnExample.

From bug 383184 comment 28:

attachment 274032 [details]: filters01.svg zoomed in and out
There seems to be a problem with zooming.
When I zoom in, the lighting increases. And it decreases when I zoom out.

Comment 1

[Robert Longson [:longsonr]]

Is this OK now?

Comment 2

[Arpad Borsos [:Swatinem]]

Attachment: filters01.svg zoomed in/out

This is with Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9b4pre) Gecko/2008021904 Minefield/3.0b4pre
The effect is not as great as seen in attachment 274032 [details], but still visible.
The brightness of the lighting effect does not change much, however the area which is lit is changing depending on the zoom level.

Comment 3

[Robert O'Callahan (:roc) (email my personal email if necessary)]

The remaining effect could be due to the size of the filter kernel. I'm not familiar with the details of the lighting filters, it would be easier if someone who is could look at this bug. In any case, I think this bug is minor.

Comment 4

[Robert Longson [:longsonr]]

Because they operate on pixels, such filters are inherently resolution-dependent. Zooming in gecko changes the resolution.