Re: [Gimp-developer] Border artifact from using nohalo to scale a layer with an alpha channel

2016-02-25 Thread Jehan Pagès 
Hi,

On Wed, Feb 24, 2016 at 11:37 PM, Elle Stone
 wrote:
> On 02/23/2016 07:45 AM, Øyvind Kolås wrote:
>>
>> In general it is better to open new bug-reports, rather than re-open
>> old ones seeming similar - long threads of possibly different problems
>> discussed in comments makes it hard to follow progress of an issue.
>> This issue seems like it might already have a bug though bug #698468.
>>
>> /pippin
>>
>
> Pippin, thanks! I completely forgot to ask the main question, which was
> whether to post a GIMP or a GEGL bug report.

Well it depends simply if you know (or think in case you don't know)
if this is a bug on GIMP or GEGL. If the project settings was a
mistake, developers can always re-qualify bug owners anyway. So that's
not a problem. :-)

Jehan

> Elle
>
>
>>> Scaling up or down using nohalo produces a partially transparent border
>>> around the layer if the layer has an alpha channel. This is a
>>> long-standing
>>> issue that still obtains (at least scaling down has produced the edge
>>> artifact for a long time, bug 698601 describes the opposite situtation
>>> for
>>> scaling up).
>>>
>>> I only just discovered that removing the alpha channel at least sometimes
>>> allows to scale a layer without creating the edge artifacts. So I'm not
>>> sure
>>> if removing the alpha channel always allows to scale without creating
>>> edge
>>> artifacts.
>>>
>>> This bug was confirmed using babl/GEGL/GIMP updated today.
>>>
>>> Should I file a new bug report? or maybe instead open one of the old bug
>>> reports?
>>>
>>> Elle
>
>
>
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Re: [Gimp-developer] Border artifact from using nohalo to scale a layer with an alpha channel

2016-02-24 Thread Elle Stone 

On 02/23/2016 07:45 AM, Øyvind Kolås wrote:

In general it is better to open new bug-reports, rather than re-open
old ones seeming similar - long threads of possibly different problems
discussed in comments makes it hard to follow progress of an issue.
This issue seems like it might already have a bug though bug #698468.

/pippin



Pippin, thanks! I completely forgot to ask the main question, which was 
whether to post a GIMP or a GEGL bug report.


Elle


Scaling up or down using nohalo produces a partially transparent border
around the layer if the layer has an alpha channel. This is a long-standing
issue that still obtains (at least scaling down has produced the edge
artifact for a long time, bug 698601 describes the opposite situtation for
scaling up).

I only just discovered that removing the alpha channel at least sometimes
allows to scale a layer without creating the edge artifacts. So I'm not sure
if removing the alpha channel always allows to scale without creating edge
artifacts.

This bug was confirmed using babl/GEGL/GIMP updated today.

Should I file a new bug report? or maybe instead open one of the old bug
reports?

Elle



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Re: [Gimp-developer] Border artifact from using nohalo to scale a layer with an alpha channel

2016-02-23 Thread Øyvind Kolås 
In general it is better to open new bug-reports, rather than re-open
old ones seeming similar - long threads of possibly different problems
discussed in comments makes it hard to follow progress of an issue.
This issue seems like it might already have a bug though bug #698468.

/pippin

On Tue, Feb 23, 2016 at 12:12 AM, Elle Stone
 wrote:
> The following three bugs are closed, but there still seems to be a related?
> new? bug with nohalo scaling (and probably lohalo, but not with cubic or
> linear):
>
> https://bugzilla.gnome.org/show_bug.cgi?id=634901
> Bug 634901 - Resizing an image with alphachannel creates 1 pixel border down
> and right
>
> https://bugzilla.gnome.org/show_bug.cgi?id=698601
> Bug 698601 - scaling up without alpha adds several-pixel gradient border
>
> https://bugzilla.gnome.org/show_bug.cgi?id=734378
> Bug 734378 - Image manipulation (scale,rotate) may cause vertical image
> artefacts
>
> Scaling up or down using nohalo produces a partially transparent border
> around the layer if the layer has an alpha channel. This is a long-standing
> issue that still obtains (at least scaling down has produced the edge
> artifact for a long time, bug 698601 describes the opposite situtation for
> scaling up).
>
> I only just discovered that removing the alpha channel at least sometimes
> allows to scale a layer without creating the edge artifacts. So I'm not sure
> if removing the alpha channel always allows to scale without creating edge
> artifacts.
>
> This bug was confirmed using babl/GEGL/GIMP updated today.
>
> Should I file a new bug report? or maybe instead open one of the old bug
> reports?
>
> Elle
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> List address:gimp-developer-list@gnome.org
> List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list
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