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From "Kevin Theisen (JIRA)" <>
Subject [jira] Commented: (SANSELAN-9) Loading Black and White PNGs produces darker images.
Date Thu, 07 Aug 2008 05:31:45 GMT


Kevin Theisen commented on SANSELAN-9:

Hi Charles,

Sorry for the late update, things got busy. I short-circuited the function and yes, the image
no longer gets darker. Since this is not a problem with Sanselan I will close this issue,
thanks for your help.

I will look into this and hopefully find out what is going on, as that function is very important
for applications painting many images. Hopefully I can figure it out soon. Let me know if
you have any ideas.


> Loading Black and White PNGs produces darker images.
> ----------------------------------------------------
>                 Key: SANSELAN-9
>                 URL:
>             Project: Sanselan
>          Issue Type: Bug
>    Affects Versions: 0.94-incubator
>         Environment: Mac OSX 10.5+, Java 1.5+, Sanselan 0.94
>            Reporter: Kevin Theisen
>         Attachments: PNGDarker.png, testImage.png, testImageNoAlpha.png
> When saving and loading pngs with Sanselan, black and white images get
> darker with each save and load. All images are held in
> memory as BufferedImages (ARGB). Have you ever seen this weird behavior
> before or how I may fix it?
> The affected images may be all PNGs, but I see this effect happening in images that contain
mostly black and white pixels. The image I use to demonstrate this problem is from a wikipedia
page of Linus Pauling:
> The image basically goes to black after saving and loading 3/4 times.

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