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06/24/2002 09:10:41 AM · #1 |
My photo was crystal clear and definately with good focus, and now it looks terrible - and there is no mercy here. So, can anyone tell me what is the best way to resample these photos to fit the rules and keep the quality? I'd appreciate the help.
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06/24/2002 09:27:00 AM · #2 |
Originally posted by RedRuthann:
My photo was crystal clear and definately with good focus, and now it looks terrible - and there is no mercy here. So, can anyone tell me what is the best way to resample these photos to fit the rules and keep the quality? I'd appreciate the help.
1) What software are you using?
2) What size (in pixels) is the original image?
3) Are you cropping, and if so, how much?
4) How much detail in the image?
All of these will affect how well an image reduces. Remember these images are essentially mosaics made up of thousands of "tiles" (pixels). If your original image is made up of 2000 pixels, and the finished one has 640, something's gotta go. This is one of the few penalties of digital -- with film, you can (within limits) make the "pixels" themselves smaller.
You can also suffer here from having a higher-end camera -- because this site requires an image of fixed size, you are having to reduce your image by a lot. If you are pretty sure you won't have to crop much, you might consider capturing at one of the lower resolution settings so the reduction to 640x4xx won't be so significant.
If you're using Photoshop, everyone recommends using the "bicubic" resampling algorithm, but try the other settings on a copy; your particular image may reduce better using another. |
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06/24/2002 09:36:39 AM · #3 |
Thank you for replying.
-Corel PhotoPaint 10
-72 dpi
-2272 x 1704
-no cropping
- contained a good amount of detail
I think of my errors was upsampling the image. I usally don't have this trouble, but I think because of the smaller details in the image, I need to understand the effects of resampling.
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06/24/2002 09:56:21 AM · #4 |
You''re welcome. Why would you "upsample" -- that would make the image bigger?
If you can re-shoot the image, I''d suggest trying it a a lower resolution to start with (maybe even directly at 640x480). Right now, you''re having to reduce to about 28%. Another alternative is see if your camera has a resolution setting which is an exact multiple of the final size (e.g. 1280x960 or 1280x854 = 200% of allowable sizes) -- this should improve the accuracy of the calculations.
* This message has been edited by the author on 6/24/2002 9:57:51 AM. |
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06/24/2002 10:33:15 AM · #5 |
Just so your aware, as far as a digital image is concerned, DPI is meaningfull only when your going to a media with a fixed pixel size.
When keeping the image on the screen the total number of Pixels 640x480 (4:3 aspect ratio) or 640x427 (3:2 aspect ratio) and the resolution of the display affect your image size.
Another good idea is to do all of your edits at the large size, and then after cropping, do the resize. If you do the edits after the crop/resize, the algorithyms that make the adjustments have less information to work with.
Also why upsample, though if your working with a jpg, before you start to work, save your image (under a new name) as a non-lossy format such as TIFF or the programs' internal format. That way each save wont repeately strip information from your picture. At the End Re-save the result as a jpg. Then start looking at the JPG Quality settings to get you as close as possible to the 150K file limit. |
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06/24/2002 10:38:57 AM · #6 |
Thank you both. I will take your comments and fiddle around with my images tonight.
Have a great day!
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06/24/2002 05:33:07 PM · #7 |
Wow, I don't know what I did previously, but I took the original image and didn't touch the dpi (I should've known better) and resampled it down and it is pretty much like the original. I think that I am pre-programed for printing images where as I would adjust the dpi.
So, thank you for your responses, and I have learned something!!! Which is the main purpose of this site, right?
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06/24/2002 06:29:25 PM · #8 |
remember to watch your compression, and do not save the image as a jepg multilple times, every time you save you lose info. Also, be sure to sharpen the image.
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