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PluginBasedJPEGReadWriter anomaly

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Gary Chambers-4

PluginBasedJPEGReadWriter anomaly

Hi all.

Iv'e noticed a slight anomaly with the PluginBasedJPEGReadWriter when reading jpeg files (at least on Windows platforms).

The upper left pixel appears to be white and the whole left-hand column of pixels have anomalous values.

Attached, for reference, are screenshots when using the plugin, the original Smalltalk implementation and Windows picture viewer.

Regards, Gary

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PluginJPEG.png (50K) Download Attachment

ExplorerJPEG.png (19K) Download Attachment

StandardJPEG.png (50K) Download Attachment

Eliot Miranda-2

Re: PluginBasedJPEGReadWriter anomaly

Hi Gary,

2010/7/6 Gary Chambers <[hidden email]>

Hi all.

Iv'e noticed a slight anomaly with the PluginBasedJPEGReadWriter when reading jpeg files (at least on Windows platforms).

The upper left pixel appears to be white and the whole left-hand column of pixels have anomalous values.

COuld you help me reproduce this case exactly? We had a crash a few weeks ago in te JPEG plugin but have not been able to find the data that reproduced it. Looks like you have a case which causes the plugin to behave incorrectly. So how do I run the plygin case and the non-plugin case side-by-side?

TIA

Eliot

Attached, for reference, are screenshots when using the plugin, the original Smalltalk implementation and Windows picture viewer.

Regards, Gary

_______________________________________________
Pharo-project mailing list
[hidden email]
http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project

_______________________________________________
Pharo-project mailing list
[hidden email]
http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project

Gary Chambers-4

Re: PluginBasedJPEGReadWriter anomaly

Well, I get the same result when loading any JPEG (Windows VM 4.0.2).

Easiest to just drag a JPEG image into the Pharo window and choose "open graphic in window".

Distinctive top-left pixel (actually transparent now I investigate further) along with bad edge.

To compare, change

PluginBasedJPEGReadWriter>>understandsImageFormat

to return false (will then use original JPEGReadWriter).

Regards, Gary

----- Original Message -----

From: [hidden email]

To: [hidden email]

Cc: [hidden email]

Sent: Tuesday, July 06, 2010 6:23 PM

Subject: Re: [Pharo-project] PluginBasedJPEGReadWriter anomaly

Hi Gary,

2010/7/6 Gary Chambers <[hidden email]>

Hi all.

Iv'e noticed a slight anomaly with the PluginBasedJPEGReadWriter when reading jpeg files (at least on Windows platforms).

The upper left pixel appears to be white and the whole left-hand column of pixels have anomalous values.

COuld you help me reproduce this case exactly? We had a crash a few weeks ago in te JPEG plugin but have not been able to find the data that reproduced it. Looks like you have a case which causes the plugin to behave incorrectly. So how do I run the plygin case and the non-plugin case side-by-side?

TIA

Eliot

Attached, for reference, are screenshots when using the plugin, the original Smalltalk implementation and Windows picture viewer.

Regards, Gary

_______________________________________________
Pharo-project mailing list
[hidden email]
http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project

_______________________________________________
Pharo-project mailing list
[hidden email]
http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project