 Lynn Snow |
help- how to interpolate for a 16x20 print I am trying to make a 16x20 print shot with a Nikon D1x. The original pixels are at 3008x1960. When I crop the shot to 16x20, leaving the resolution field blank, I get 1610x1288 at 81dpi. This seems way to low to get any good resolution for a print. Looking at my PS CS2, should I use the interpolation feature and resample my image. If anyone is familiar with resizing using PS, I would be so very thankful for any information you could lend. Oops, forgot to mention, the shots are taken in RAW. Thanks
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Michael H. Cothran |
Lynn, If you don't get any correct responses today, I will be able to tell you exactly what needs to be done, but not until this evening (Thursday, 9/29). I'll need to wait until I am on my home computer, and have PS open in front of me. I can tell you this now - You will need to both crop and interpolate, but it won't be a big issue. You will want resolution to be at least 200 ppi, and more if you can muster it. We'll determine that this evening. Michael H. Cothran PS - you can contact me at my personal email address - michaelhcothran@comcast.net
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Michele Wassell |
Hi Lynn... I do this all the time and have a good success result. Open your photo Image Size dialog open w resample turned on Change the resample image interpolation method to Bicubic smoother Switch the unit of measurement pop-up menus in the diaglog from inches to percent and type in 110, which increases your image by 10%. Click okay and re-do the steps until you get to the desire size you need. Once you are done, change the dpi to 200 and your inches to 16x20 and you should be set. Feel free to ask me any questions that you may have. Hope this helps. Michele :)
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Michael H. Cothran |
Lynn, I'm going to try to help you also, but short of waiting for further information from you, I am going to presume two things - 1. Your 3008x1960 original pixels are @ 72 ppi 2. Your 16x20 is horizontal. Note - if it's vertical, just reverse the instructions below where applicable. Here we go - 1. Open your RAW file, and go to Image>Image Size and look at the figures. Your image should be 16.9M, and @ 72 ppi, your size should be 41.778 x 27.222 inches. If so, we're ready to begin. If not, contact me offline.
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John G. Clifford Jr |
First, you're going to have to crop the image to get it to fit into a 4:5 ratio picture. It's best to crop only from the horizontal if you want to retain maximum image quality (pixel count), so keep that in mind if you can. What I usually do when up-sizing an image like this to fit in a particular 'frame' is to first up-size the ENTIRE image so that the shortest side will fit the shortest side of the 'frame'. So, I'd go into PS2 and in the Image Size dialog, I'd choose to retain proportions, then I'd change the resolution (by doing some simple math... 1960 pixels will fit into a 16" high frame if the pixel density is set to 122.5 pixels per inch) to get my desired 16" x 'X' image (here, 'X' will be 24.5" wide). Then, I'd use the Cropping tool to crop 4.5" off of the sides of the image. An easy way to do this is to select the entire image and copy it, then resize the image size itself to 16" x 20" without touching the resolution figure, then 'Ok', and once back to the image itself, paste the original image back in... and then use the mouse to 'drag' the selected image around the 'frame' until you get the composition you want. Then, deselect the image. Now you have an image that has not lost ANY quality yet will fit in the 'frame' you want. Next, you want to up-rez your image so you can get your pixel per inch count higher. Some people (as described above) like to resize by 10% incrementally (open the Image Size dialog, upsize by 110%, 'Ok', repeat until the dpi is where you want it)until they reach the resolution they want. Others just do it all at once. Save As... your file, try it both ways, and see which one looks better.
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