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Photography Question 

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jpeg to tiff change and file size.


How do I get my digital pictures changed into TIFF files and how do I make sure they are no larger than 2.5mp so that I can submit them for your contest? Or how can I dictate what size these images are when they are converted to Tiff or ping?


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May 22, 2007

 
- Carlton Ward

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  Hi Edward,
I usually work the opposite way. I download raw files and then save them as tiffs (which can be as big as 48MB) and if I want to make them smaller, I save them as jpegs. I use photoshop and can resize them there and save them at about an 8 on the "save as" quality scale and this usually brings them down enough to post online. You can always check the file size by doing a right click on the image and select properties and this will tell you the file size. 2.5 MB is still pretty large and I make my images even smaller (about 500 KB) which makes uploading faster. Also select sRGB for uploading to the internet. If you dont use Photoshop, there is a program called Irfanview that is a free download and does a good job of resizing & renaming including batch if you need to do an entire folder at once. Hope this helps.


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May 22, 2007

 

W.
 
JPGs are compressed files. Compressed by discarding image data. So JPGs already only contain very incomplete data sets of the original image.
(Minimum JPG compression e.g. 1:3, means 66% of the original image data is discarded; high JPG compression e.g. 1:30, means that 97% of the original image data is discarded).

TIFFs are uncompressed, lossless files. So they contain full image data sets.

If you "Save As..." a JPG to a TIFF, you simply convert an incomplete data set to another format, but still with the same amount of image data. Which is (very) incomplete. So while the ".TIFF" extension suggests that the new file is a lossless, full image data set, it is NOT!

You can save TIFFs from TIFFs without losing image data.
You can convert RAWs to TIFFs without losing image data.
Once your original is JPG, that is already an INcomplete image data set. It can never be restored to a full image data set. Whatever conversion method you choose. Data that ain't there simply ain't there!

Zoom in good on one of your JPGs. You'll see 'pixelation'/'artifacts'. THAT'S what JPG compression does.
No amount of conversion can restore the original image data there.


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May 23, 2007

 
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