Sunday 24 February 2019

Batch "resize" JPEG images to a fixed file size


Changing quality of the JPEG when saving an image, changes the file size. For eg. I have the following image. Dimension: 243px x 53 px Quality:100% File Size:9.7kb Background:


sample image


size1


If I edit the image, keeping the dimensions and Quality same, the file size still falls to 6.1kb.


sample 2


size 2


Problem: I am using Fotoresizer, which has a batch Quality change option, but due to the above problem, you cannot predict file size from quality alone. So when I batch change quality of a set of 200px x 300px images set at 20% quality, some files will turn out at 6kb, whereas others will turn out at 15kb, when the file size I want is 10kb.


Is there any program or programmable solution, which lets me save all files in a range of 10-11kb, without me manually changing the quality slider to change file size each time.



Answer



IDsizer will allow you to do this you can set a maximum file size from the interface and drop a batch of files to resize.


http://www.idimager.com/WP/?page_id=396


Just as an aside, be aware that the quality once you have done this may be quite poor. Also if the image will save at a high quality with out compression some files could be less than 10Kb.


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