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How to Reduce Image Size ... ?

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Old 07-21-18, 09:19 PM
  #26  
GlennR
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Web based version of Photoshop.

https://pixlr.com/editor/
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Old 07-22-18, 09:54 AM
  #27  
dylandewandel
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Originally Posted by rachel120
Doesn't it all go together? The reason the file sizes are so huge is because the dimensions of the pictures as taken by a phone are 3.5 feet by 6 feet.
Yes, but no; you can reduce file size without changing the dimensions, the real challenge is decreasing file size without effecting image quality.
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Old 07-22-18, 11:38 AM
  #28  
ericzamora
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Originally Posted by dylandewandel
Yes, but no; you can reduce file size without changing the dimensions, the real challenge is decreasing file size without effecting image quality.
correct. to clarify (i think), you can reduce file size without changing the dimensions THROUGH COMPRESSION. jpeg is a lossy compression scheme. you lose digital material/info, but the dimensions of the photo remain the same. in Photoshop, there is a sliding scale from 1 to 12 during an intermediate step in saving. the more you compress, the more chance you'll lose quality due to the jpeg process throwing away "redundant" pixels. but you can increase compression quite a bit without noticing it once actually posted.

it's all a balancing act. my iPhone photos are huge. I crop to something like 8-10 inches across for horizontals (i've never embraced pixel dimensions lol), at 80-100ppi (you only really need at least 72ppi). then while saving as a jpeg, i choose 5, 6, or 7. this usually leads to an image from 60k-125k. with no evident loss of quality to my eyes.

eric
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(also a professional photographer, newspaper, so i work with jpegs every day)

Last edited by ericzamora; 07-22-18 at 11:42 AM.
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