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Re-sizing high res pictures
I am taking pictures for a website at 2560x1920 px, and then re-sizing
them to 448x336 px before uploading them to the website so they do not take up a customer's entire screen when viewed on the site. Am I losing quality in the photos? Also, is this just a waste of card space? |
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Re-sizing high res pictures
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Re-sizing high res pictures
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Re-sizing high res pictures
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#5
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Re-sizing high res pictures
If you plan on doing any editing, I'd say take them at full res, edit
and then shrink rather than trying to edit the smaller versions. By losing quality, what do you mean... are you asking whether the smaller photos will be of lesser quality such that they simply don't look as good on the web site in their smaller form as they do in full size on your computer screen? Or are you not talking about looks but rather attributes such as pixel count and print size? When you shrink a photo, you will loose both the total number of available pixels and print size (print size will still exist, but it will be smaller). In terms of looks, I think it depends on the image in your picture. If your image is busy, then sometimes you'll wish the pic were larger so that you can more clearly see the detail. For cleaner shots, like portraits, smaller pics can look quite good. It can depend also on what you're going to do with the pics. Look at the news sites, like CNN. Even if the pics are taken at full res, most of the time the pics are cropped and/or just slapped up to the web site as-is. Kevin wrote: I am taking pictures for a website at 2560x1920 px, and then re-sizing them to 448x336 px before uploading them to the website so they do not take up a customer's entire screen when viewed on the site. Am I losing quality in the photos? Also, is this just a waste of card space? |
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Re-sizing high res pictures
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#7
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Re-sizing high res pictures
And by "as-is" I mean without editing, not without resizing.
Thanks. Kevin k-man wrote: If you plan on doing any editing, I'd say take them at full res, edit and then shrink rather than trying to edit the smaller versions. By losing quality, what do you mean... are you asking whether the smaller photos will be of lesser quality such that they simply don't look as good on the web site in their smaller form as they do in full size on your computer screen? Or are you not talking about looks but rather attributes such as pixel count and print size? When you shrink a photo, you will loose both the total number of available pixels and print size (print size will still exist, but it will be smaller). In terms of looks, I think it depends on the image in your picture. If your image is busy, then sometimes you'll wish the pic were larger so that you can more clearly see the detail. For cleaner shots, like portraits, smaller pics can look quite good. It can depend also on what you're going to do with the pics. Look at the news sites, like CNN. Even if the pics are taken at full res, most of the time the pics are cropped and/or just slapped up to the web site as-is. Kevin wrote: I am taking pictures for a website at 2560x1920 px, and then re-sizing them to 448x336 px before uploading them to the website so they do not take up a customer's entire screen when viewed on the site. Am I losing quality in the photos? Also, is this just a waste of card space? |
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Re-sizing high res pictures
Bob Williams wrote: wrote: I am taking pictures for a website at 2560x1920 px, and then re-sizing them to 448x336 px before uploading them to the website so they do not take up a customer's entire screen when viewed on the site. Am I losing quality in the photos? Also, is this just a waste of card space? Most cameras have the ability to capture images at different sizes. If you KNOW that a particular image will be uploaded to a website, you can save card space by shooting at a reduced size. However you will still lose image quality by doing so. Your camera captures all images at 2560x1920 pixels. Only when you SAVE the image to the memory card is the size reduced (Resampled) Your photo editor may use a better resampling algorithm than the camera, but I doubt that anyone could tell the difference when displayed at 448x336 pixels. I like having a choice in which algorithm to use. My tool of choice is Graphic Converter for OSX. It has several algorithms available. I like the "Smooth" algorithm, although some combinations of downsizing produce a grid-like pattern in areas of blue sky. Some simple downsizing (especially MS Paint) will produce "jaggies" on diagonal edges. I'm not 100% sure what a camera might use, although most of what I've seen is going to require some sort of conversion that's more complicated than combining four pixels into one. Here are two versions of the same picture (Dennis Eckersley in celebration of his Baseball Hall of Fame induction). The original was 2048x1536, and the downsized versions are 25% reduced in each dimension (512x384) using Smooth and Bicubic. Each was then sharpened 15% (normal) and saved at 80% as suggested by another poster. Here's the "Smooth" version. I think it has the appearance of less sharpness and detail, but the edges of the Corvette look straight. http://img205.imageshack.us/my.php?image=ecksmoothdv2.jpg With Bicubic, the overall look is sharper, but there's a very noticeable "jaggie" along the back end and trunk line of the Corvette. http://img205.imageshack.us/my.php?image=eckbicubictk7.jpg |
#9
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Re-sizing high res pictures
wrote in message oups.com... I am taking pictures for a website at 2560x1920 px, and then re-sizing them to 448x336 px before uploading them to the website so they do not take up a customer's entire screen when viewed on the site. Am I losing quality in the photos? Also, is this just a waste of card space? You are obviously losing information by tossing out pixels, just make sure you don't add degrading (aliasing) artifacts and lose quality as well, by using the wrong down-sampling algorithm: http://www.xs4all.nl/~bvdwolf/main/foto/down_sample/down_sample.htm and http://www.xs4all.nl/~bvdwolf/main/foto/down_sample/example1.htm -- Bart |
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