OFF2000: PNG Files from Adobe Photoshop Appear Incorrectly
ID: Q238559
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The information in this article applies to:
SYMPTOMS
If you save an Adobe Photoshop image as a PNG (Portable Network Graphics) file and then insert the PNG file into an Office 2000 application, the PNG file may appear too dark or too light compared with the original Photoshop image.
CAUSE
The Adobe Photoshop PNG export filter incorrectly doubles the Gamma value of exported picture files.
RESOLUTION
To resolve this issue, you must export the PNG file from Photoshop again, or use the Microsoft Office Picture toolbar to lighten or darken the image.
Method 1
- Inside your Office application, click the PNG to select it.
- If the Picture toolbar is not visible, point to Toolbars on the View menu, and make sure that Picture is selected.
- Use the More Brightness and Less Brightness buttons on the Picture toolbar to adjust the brightness of the PNG picture.
Method 2
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- Before you export the PNG file inside Adobe Photoshop, point to Color Settings on the File menu, then click RGB Setup.
- In the Gamma area, change the Gamma correction value to exactly half of the displayed value. Click OK.
- On the File menu, click Save Copy As, and then resave your PNG file with a new name. The new PNG will appear correctly in Microsoft Office.
STATUS
This problem occurs when you use Microsoft Office version 2000 and Adobe Photoshop version 5.
MORE INFORMATION
Gamma correction is a formula or method designed to maintain the lightness or darkness of a picture across multiple output devices (usually computer screens). There are many different methods and types of Gamma correction.
Essentially, when a picture with an assigned Gamma value is displayed using hardware or software that supports Gamma correction, the picture is corrected to more closely represent the lightness or darkness that it possessed in the original device or application.
When Gamma correction is applied to a PNG picture, some applications ignore the Gamma correction information. Microsoft FrontPage and Microsoft PhotoDraw ignore the Gamma correction information generated by PNG files. (Note that while FrontPage ignores the Gamma correction information, Internet Explorer 5 does not. Therefore, pictures that look okay inside FrontPage may appear too light or too dark when previewed in your browser.)
Additional query words:
OFF2000
Keywords : kbdta
Version : WINDOWS:2000
Platform : WINDOWS
Issue type : kbbug