why would a photograph of an offset printed piece show a moire pattern?

highest megapixel camera image

4thtennenb

the printed piece to the naked eye doesnt show a moire pattern. it is definitely the printed pieces' line screen as the solid/pantone color and the rest of the image that isn't printed looks fine.

it's also a very high megapixel camera set up/ pro quality.

Answer
If you look at the image with a magnifying glass, you will see that it is actually made up of tiny colored dots that are too small for the eye to notice. If it's a black and white image, they will be shades of gray. Your high-megapixel camera, however, can see the dots because it has millions of pixels that are even smaller than the dots. The moire pattern is due to the printed dots falling in and out of phase with the sensor's pixels.

You could try putting the image part slightly out of focus, which would smear out the linear frequency differences. You might also try shooting the image part at lower resolution. In either case, you'd have to layer it back into to larger work.

Is there a way you can make photos look higher quality?

coolkid999

I have some photos that are high quality but is there any way to make them look even clearer as if they were taken by a higher megapixel camera?

Answer
More megapixels does not make pictures clearer unless you're taking a very small piece of the picture and blowing it up. Its about precise focus, fast enough shutter speeds and great glass when it comes to taking clear pictures. My 5MP Olympus C5050 takes pictures as clear as any of my DSLR's, maybe better in some cases. I don't have as much latitude to do large prints with it, but in terms of clarity and quality overall, its remarkable. I have done larger prints with it, but natively right out of the camera, no. Sometimes, for some shots, you can intentionally soften the picture giving the pic an "artistic" feel, so that the focus becomes more secondary. The shot has to be the right kind of mood to pull it off though, it doesn't work with anything. I've done it to save shots that I really loved, but as they were they just didn't work. Here's an example.

http://www.pbase.com/inspzil/image/18396218

Its not a perfect system, but if you have something that's good, but not perfect, it can at least make it salvageable. Upsizing them in photoshop will effectively make them more megapixels, but it won't make them any clearer. You just have to take them as clear as possible. Sharpening pics after the fact most of the time has no effect, or a negative effect on the image. The only time I've found it to be effective is when shrinking an image down, you can hit sharpen once to make it clearer. Good Luck.

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Title Post: why would a photograph of an offset printed piece show a moire pattern?
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