Apache OpenOffice (AOO) Bugzilla – Full Text Issue Listing
|Summary:||scaled bitmaps are displayed extreme bad, OO fails to use filter for scaling bitmaps|
|Component:||code||Assignee:||AOO issues mailing list <issues>|
|Status:||ACCEPTED ---||QA Contact:|
|Priority:||P3||CC:||deschmit, don.troodon, issues, mdxonefour, nesshof, sos, tay, tora3, uwe.luebbers|
|Issue Type:||DEFECT||Latest Confirmation in:||---|
Description norbert2 2007-10-29 20:06:45 UTC
Hi, I have attached a ZIP that cotains 4 files: 1. a PNG 2. a presentation containing the PNG 3. two screenshots (also in PNG format): one of OOo, one of MSO Please compare the two screenshots (demod_oooimp.png and demod_msppt.png). They are as different as day and night! In OOo I cannot recognize anything while MSO gives a clear display. It looks like OOo does not apply filtering for scaling bitmaps. All OOo applications are affected by this problem. As electronics engineer I often get documents containing circuit diagrams or technical drawing as bitmaps. Many of them cannot be viewed in OOo because of this problem.
Comment 2 thorsten.martens 2007-11-05 12:22:56 UTC
TM->WG: please have a look, seems to be yours.
Comment 3 wolframgarten 2007-11-05 13:32:56 UTC
Changed to defect. Reproducible. Reassigned.
Comment 4 kpalagin 2008-03-04 17:48:05 UTC
Sven, are we on track for 3.0 with this issue? Thanks. WBR, KP.
Comment 5 wolframgarten 2008-05-23 15:06:44 UTC
Comment 6 tora3 2008-07-27 06:42:23 UTC
Does the efforts  also cover this issue?  http://wiki.services.openoffice.org/wiki/DrawingPrimitives
Comment 7 norbert2 2009-01-19 15:57:47 UTC
Please consider to fix this issue for OOo 3.1. In my opinion this bug should be fixed together with antialiasing. So OOo 3.1 would be a suitable release to fix also this nasty display bug.
Comment 8 ooo 2009-01-21 11:16:27 UTC
Although we already use bilinear filtering to scale pixel graphics, there's no doubt that PPt is quite ahead of OOo in this case. We definitely need to take a look at this. Due to other tasks with higher priority we're working on at the moment, I don't think that a bugfix will make it into 3.1, but 3.1.1 seems to be realistic for me to fix this. Since we don't have such a target right now, I'll temporarirly set the target to 3.2, so that it doesn't get out of focus. Thanks for your attachment files. These are a good test case for fxing this problem.
Comment 9 ooo 2009-01-21 11:17:34 UTC
Comment 10 norbert2 2009-01-21 12:04:00 UTC
ka, thanks for working on this bug. It looks like you have forgotten to set Target milestone to OOo 3.2. I have changed it.
Comment 11 kenno 2009-02-10 20:34:52 UTC
The problem is not that the bilinear filter is not adequate, but that Impress fails to apply it correctly! To illustrate what I mean, I loaded norbert2's high-resolution original (demod.png) in Gimp and scaled it by a similar amount as in his screenshots using the bilinear filter. See demod_gimp_bilinear.png in attachment. While norbert2's demod_msppt.png looks slightly prettier (probably because of ppt using a more advanced filter), my demod_gimp_bilinear.png is quite acceptable; it's a day and night difference with norbert2's demod_oooimp.png . The current behavior of OOo is intolerable to me, while proper bilinear scaling would be quite satisfactory. I would recommend fixing the bilinear filter ASAP rather than wasting time on introducing a more advanced one. As a side note, those more advanced filters have specific weaknesses; while they generally do a better job in high-contrast images, they often induce artifacts in low-contrast ones. Bilinear is prefect in its simplicity - it just makes all images slightly blurry, as if one would apply a Gaussian blur with a 1 pixel radius.
Comment 12 kenno 2009-02-10 20:37:47 UTC
Created attachment 60075 [details] The same image, scaled by the same amount using a bilinear flter. Result is much better than what OOo does.
Comment 13 kenno 2009-02-10 20:49:37 UTC
Created attachment 60076 [details] Now it's *really* scaled by the same amount. Conclusions unaffected.
Comment 14 ooo 2009-11-09 09:07:18 UTC
Set issue type to enhancement (from a user POV) and retargeted to OOo 3.3 due to resource contraints
Comment 15 Armin Le Grand 2010-03-31 10:33:16 UTC
*** Issue 110337 has been marked as a duplicate of this issue. ***
Comment 16 sos 2010-03-31 14:43:54 UTC
Created attachment 68670 [details] Doc showing the diff between OO, Gimp, Irfanvieuw, Imagemagick
Comment 17 norbert2 2010-05-21 10:05:28 UTC
Are there news about the progress of this issue? Will it be fixed in 3.3? (It already has been re-targeted.)
Comment 18 ooo 2010-05-21 11:58:56 UTC
No progress till now due to 3.2.1 release workload, but target hasn't change, so...
Comment 19 ooo 2010-06-11 10:44:38 UTC
changed to defect
Comment 20 thorsten.ziehm 2010-11-09 08:33:19 UTC
OOo 3.3 is nearly final. I change the target of this issue to OOo 3.x. Please find a solution and set a correct target, if you know when a fix can be integrated.
Comment 21 ooo 2010-11-15 13:21:30 UTC
set target to 3.4
Comment 22 deschmit 2014-11-19 22:21:01 UTC
Should this get a new target version?