Reducing moireÕ pattern in digital images Special thanks to Karl Kuntz of the Columbus Dispatch for sharing this with us When working with digital images you will occasionally encounter a pat- tern in your images (left). This is known as a moireÕ (moor-ray) pattern. This is caused by a conflict between the striped array CCD and a pattern in something in the image. You should accquire the image before ruling it out. The contact sheet will sometimes show a false moireÕ. The pattern is often the effect of the monitor scan lines and disappears when viewed at a larger magnification. If, after acquiring Under the Window menu, pull down the image, the to Palettes and select the Show moireÕ pattern is Layers command from the pop-up still there the fol- menu. Your image will show up in the lowing technique palette and be labled ÒBackgroundÓ. can be used to Select it and drag it down to the Òturn- minimize the ing pageÓ icon at the bottom of the effect. palette (right - see where arrow is pointing). This will create a back- ground copy which will automatically be selected. Double click the Under the filter menu, background copy pull down to blur and and rename it select Gaussiun blur. color blur. OK this Increase radius until action. Select the the moireÕ pattern is pop-up menu that no longer evident. says Normal. Pull OK this. If this down until you come to the entry that doesÕnt correct the says Color . problem try Motion Blur filter. Return to the Layers menu, click and hold on the arrow at the top right side of the menu. This will display anoth- er pop-up menu. Slide over and pull down until you reach the Flatten Image command. This will sandwich you lay- ers together and you should now see a reduction in the color fringing in areas effected by the moireÕ pattern.