To use the Median filter
On a pixel-by-pixel basis, the Median filter applies the median color
value of all pixels within the specified radius. Although the filter
ignores extreme values in its computations, higher radius values can
still wash out an image.
1
Select one or more paint objects to adjust. You can select an
area in one image to adjust the selected area only.
2
Choose Image > Filter > Noise > Median.
3
Type a value from 1 to 16 in the Radius text box, or drag the
slider. Smaller radius values produce subtler effects.
4
Click OK.
To use the Despeckle filter
The Despeckle filter can remove defects such as dust and other
speckling in images. The filter blends pixels with the lightness values
of neighboring pixels. Its a good idea to select areas that need cor-
rection before applying the filter.
1
Select an area in an image to adjust. If you dont make a selec-
tion, the entire image is affected.
2
Choose Image > Filter > Noise > Despeckle.
3
Drag the slider or type a number in the text box to set the
Threshold value. Higher values produce greater blending of pixels.
To reduce dust and scratch marks
The Dust and Scratches filter can remove dust specks by replacing a
pixels value with a median value. The filter does not change a
pixels value unless the absolute value of the difference of its gray
value and the median gray value of its neighborhood is greater than
the Threshold. Larger numbers of pixels are replaced by the median
value when the Threshold is low.The practical effect of this is that
larger pixels regions (larger specks) are reduced or removed with a
lower Threshold. Therefore, you can use the Threshold to control the
size of the artifacts you want to remove.
1
Select an area to adjust in an image. If you dont make a selec-
tion, the entire object is affected.
2
Choose Image > Filter > Noise > Dust & Scratches.