imac abuser said:
Hello,
I have Adobe Photoshop CS, and Aperture. I want to know how I can crop a picture in the correct dimensions so when I print a 4x6 it's not all pixelated, or grainy.
Chris
There is no way to crop an image and not loose the pixels you crop off. It's not a matter of technology it is a matter of logic: Cut anything in two, throw away one part and you will have less of what you had. Basic logic, no way around it. Technology can't help you.
So you have less pixels. What to do? You could "resample" the image. This process will creat pixels by interpolation and will cure the pixelation problem but resampling does NOT creat more infomation the overall effect is to blur the image. The effect is the same is taking off your glasses and looking at the pixelated image.
There is a rule of thumb. For 4x6 prints of best quality you need about 300 pixels per inch. that means for the 4x6 size 1200 x 1800 pixels if you have a 6MP DSLR that shoots 3000 x 2000 frames then you have only a little room to crop before you break the 300 per inch rule. You can reduce the rule to 240 or even less. Newspapers print at about 75 per inch. But you are seeing the results in your work of grossly violating the 300 pixels per inch rule -- quality suffers. resampling can help mask theses effects but the result is an unsharp print.
The best thing of course is to use your feet and get closer to the subject. Look all around the edges of the frame to make sure there are not unwanted objects in the frame and _then_ trip the shutter. If you do this then there is less need to crop.
After you take the shoot LOOK at it. If it will require a crop walk forward a bit and take another shot. If there is a physical bearier such as a fence, rail, water or a cliff then you must resort to using a longer telephoto lens but you will always get the beter result if you can use your feet.