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I have a printing problem with several images -- there is a light, barely discernable, square grid pattern of small black dots on the prints. On one print the grid lines are about 3/8" apart and on another about 5/8", both on 8 x 12" images. The images are TIFs that I created by exporting them to Photoshop for some work and then back to Lightroom. However, when I print the same images in Photoshop there is no grid. This does not happen with all my Lightroom to Photoshop and back TIFs. I have no idea what might be going on. I using a Canon Pixma 100 printer in color. I can't see the grids in Lightroom (or Photoshop), but they show up on the Pixma preview screen.
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Looking closer I can see that the grids are not black dots, just darker lines of the same color in that area of the photograph.
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Are you using an icc profile?
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Here are two samples prints. I've emphasized the grid lines which are otherwise very faint and hard to see unless you are holding the actual print in your hand.