GeoExpress - Knowledge Base Articles

A060401 - Speckled effect in white areas

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GeoExpress

Summary:

A “speckled” effect appears in white areas of indexed color images.

Cause:

When GeoExpress converts indexed color images to 24-bit for encoding, it actually adds color to the image. This process can create a speckled effect in white areas of the image. This effect is most noticeable in computer-generated, indexed color images.

Solution:

Some compensation for this effect can be achieved through adjustment of the Weight and G-Weight settings, which are located in the Options dialog box on the Advanced tab.

To avoid this speckled effect, scan the source images at 24-bit RGB, or turn off the Image Enhancement option (MG2 format only).

Another solution is to use lossless encoding, which will preserve all input pixel color values.

This article was last updated or verified on 12 October 2012.