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Image file size decreases


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#1 nati12

nati12

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Posted 08 April 2016 - 02:23 PM

My English is not good, then hope you understand through Google translate.
 
 
I spent a few pictures from the phone to the computer. Each image was between 5-7MB. At first the picture was the original file size, but after opening the image in the image viewer of windows then i closed, Was written "saver" and then later I saw a picture fell from 7 MB to 3. Why is this?

Edited by Chris Cosgrove, 08 April 2016 - 04:07 PM.
Move from Win 7 to 'Graphics and photo editing'.


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#2 Chris Cosgrove

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Posted 08 April 2016 - 04:23 PM

Google translate has worked for you - your post is fully understandable !

 

First of all - welcome to BC and 'Viva Barcelona !'

 

When you transferred your photos to the computer there was no need to 'Save' them, and after viewing them there was no need to save them as they were already saved on your computer.

 

You do not say what application you were using but a lot of applications do not save JPEGs at 100% by default but at some lower figure. If the default in the application you were using is set at 50% this would explain the difference. Viewing a JPEG image should never affect it at all but JPEG is a 'lossy' format and every time you process such an image you lose some of the information in it.

 

Processing a JPEG two or three times makes little difference, so long as you are saving changes at 100%, but try 30 or 40 !

 

Chris Cosgrove






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