 Paula Hildy |
Enlarging JPEG Files I have a Canon 10D. Most of the time I shoot in the largest format (not Raw). I'm interested enlarging some of my photos to 24 x 36 or 30 x 40. My question is? Do I do my enhancing in PS on the photo when I download it and then enlarge the file for print or do I enlarge the file first and do my enhancing then. Also, is it best to enlarge the file using percent in PS or by actually putting in the dimensions in inches? Thank you for your assistance.
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Chris J. Browne |
Enlarge your image when you are done editing with genuine fractals. If you must use Photoshop for enlarging is doesn't matter whether you use percent or actual dimensions. I specify my output based on the printer it will be printed on. Therefore if I want a digital image to have one of its sides be 30 inches on a machine that prints at 300 dpi then the image needs to be enlarged/scaled to 9000 pixels on that side. Make sure to not save in JPEG format, quit, edit save in JPEG, quit, open, edit, save in JPEG. The effects of multiple saves in JPEG format will show up.
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Paula Hildy |
Thanks for your response. You mentioned that if I was using Photoshopd for enlarging... is there a better way to enlarge?
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Kelly Plitt |
Regarding multiple saves in JPEG - Chris is right - each time you save in Jpeg, it compresses again and again, resulting in loss of image quality. To avoid this in photoshop, if you save your "working" images in TIFF or PSD (smaller file, just as good) then save your final versions in Jpeg - all will be fine. For me, since my "working" versions all involve multiple layers, There is no choice, I must save if PSD or TIFF Until I'm done. Regarding enlarging - Photoshop is probably the best. However, if you must use another program avoid microsoft photo editor at all costs! There is a bug in this program that causes wierd pixellation problems upon image resizing. Their save function also defaults to a low quality setting which the user doesn't realize until it's too late! I usually enlarge my photos before editing - this works well, especially if you apply any kind of filtering. Good luck! Kelly
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Michael H. Cothran |
Several things here - You really should shoot in RAW mode to begin with if you're going to enhance in Photoshop, then enlarge any. Your 10D at its best resolution (RAW mode) will only produce a file size about 17MB, which is not nearly big enough for 24x36. You need at least 70MB, so you've got a ton of interpolation to do. Your final image quality will probably really be bad, but if you can live with it, go ahead. If you are using Photoshop to interpolate (increase image size), do it in small increments to gradually build your file size. You can get by with 200ppi @ 24x36. "Genuine Fractals" (mentioned above in another response) is a software plug-in you can buy for the purpose of interpolation. It does a better job than Photoshop's Bicubic interpolation. I regularly print 24x36 from an Epson 7600 printer. I begin with file sizes anywhere from 35MB to 100MB, and interpolate it to 200ppi. You can see some at my website listed below. All the images in the fine art section are sold in my Arts & Crafts booth in either 24x32 or 24x36 size. Michael H. Cothran www.mhcphoto.net
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Melissa L. Zavadil |
Does someone know where one might be able to purchase the Genuine Fractals program and how much it typically costs?
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Melissa L. Zavadil |
Michael, You stated that if you use photoshop to interpolate then one should do it in small increments to gradually build the file size. Would you go through the process of increasing the size of the picture several times? (not just one large leap)Or are you meaning something different?
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Chris J. Browne |
Here is the link to a store that has Genuine Fractals. There are two versions. The $90.00 version works with 8-bit RGB files and the $150.00 version steps up to 16-bit RGB. Most photographic color printers (Noritsu 3212 DLS) use 8-bit. http://www.academicsuperstore.com/market/marketdisp.html?PartNo=729794
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