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DPChallenge Forums >> Tips, Tricks, and Q&A >> Resizing and Blurrinng
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 04/09/2004 01:58:04 AM · #1
Hi after reading the tutorial how to create printable image i resized my images for the size i want @ 300dpi.

Problem i notice that , after i resize , at the end if i a view the image using option actual size, Image which had sharp focus earlier, now appear , blurred, focus is really soft.

What is the reason for this
 04/09/2004 02:09:09 AM · #2
After resizing this will happen in different degrees both when downsizing and upsizing. You usually have to apply unsharp mask after you resize.
 04/09/2004 02:11:52 AM · #3
yes... unsharp mask application is the next step after the resample process...

04/09/2004 10:24:48 AM · #4
How much were the imnages upsized?? Remember you can't create data from nothing. If the width and length (in pixels) more than doubles from original to final size, you will certainly see that the image is noticeably softer when viewed at 100%.
Remember that this will not necessarily be that apparent on the print. When viewing on the screen, you are viewing at 70-130 ppi (pixels per inch) depending on your screen's setup. But you've set the image for 300dpi, so when it prints, it will look much sharper from the same distance. Make sense?
 04/09/2004 11:25:02 AM · #5
Hi Kirbic, I think you got it right as Lot of times in past , printouts were sharp but view on monitor was really soft when i saw actual size.

Orginal size was 1400 pixel at 200 dpi, i resized from 1400 to 2100, i.e height of the image was 7 inches
 04/09/2004 12:47:21 PM · #6
Final print size was 7 inches? Correct me if I'm wrong, but I don't think a 7 inch print would loose that much detail. Especially since the original image was 1400 pixels. By the way, I've heard that it helps to increase the DPI in 10% incraments rather than just re-sizing in one pass.
 04/09/2004 02:44:59 PM · #7
ya final size was 7 inches and i increased size with 5 % increment as shown in tutorial.

But there is another issue that orginal image was of 1200 x 1600 and this 1400 pixel image was achieved through cropping i.e i cropped an image of size 532 x 1400 from an image of 1200 x 1600
 04/12/2004 08:52:24 AM · #8
Originally posted by kirbic:
How much were the imnages upsized?? Remember you can't create data from nothing. If the width and length (in pixels) more than doubles from original to final size, you will certainly see that the image is noticeably softer when viewed at 100%.
Remember that this will not necessarily be that apparent on the print. When viewing on the screen, you are viewing at 70-130 ppi (pixels per inch) depending on your screen's setup. But you've set the image for 300dpi, so when it prints, it will look much sharper from the same distance. Make sense?


I was thinking printable images are 300dpi , and viewing screen is supposed be 70-130 ppi and because of this even a sharp picture will look soft focus despite it being sharp when printed, so i was wondering so how do i do USM as there images is for 300dpi and screen is 70-130 ppi

So how do i solve, i mean were supposed to USM after resizing
 04/12/2004 10:24:03 AM · #9
take a conservative approach on sharpening images you have upsized. If they look good printed, then that is the ultimate test. It's easy to oversharpen upsized images, and the prints will suffer. Bottom line, do what looks best to your eye on the printed image.
 04/12/2004 10:43:24 AM · #10
Years ago I asked a commercial printer that used an offset color press, what resolution a high quality image had. He said that National Geographic uses 120 dpi for their magazine spreads, but that some use a bit less and some a bit more.
Using that information as a guide, that is 120 dpi per color, an image to be printed should be in the range of 360 dpi for rgb printers and 480 dpi for cymk printers. In practice, I have found that 300 dpi is more than adequate, and 200 dpi is acceptable.
Resampling an image to change size cannot change the sharpness if upsampling, but always reduces image detail if downsampling. The appearance on a video monitor may be counter to that statement, as it's resolution is fixed!
In Photoshop you may resize the image print size without changing the pixel count.
If your main concern is images for DPChallenge, then there is of course, no choice but 640 pixels maximum width or height.
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