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How to maintain the original quality of a image after resizing it?

Jun 23, 2012, 14:36
Post: #1
How to maintain the original quality of a image after resizing it?
Hello friend,
My problem is related with the quality of a image.
My question is how to maintain high quality (original quality) of a image after resizing it?
If i resize it with same ratio like:

2816x2112px to 1600x1200px (4:3)
2816x1584px to 1920x1080px (16:9)

Mainly i use scale image option in Gimp.
But now i need to resize many images for my work so i tried
David's Batch Processor to resize my images.
After using it, i found there is some quality promble with the resized image.

Am i right or there is problem?

Then i tried, the scale option with, use quality setting from original image and JPEG quality parameter is 95, in gimp but the problem is same.
I did it with also with David's batch processor- JPEG quality parameter is 95.

Other thing is that,
the original image 2816x2112px (4:3), size- 3.6 MB is displaying in image viewer with 47%
and
the resized image 1600x1200px (4:3). size- 1.2 MB is displaying in image viewer with 83%,

So my questions are:
How can i check the quality of a image after resizing it, means the image is exactly same as the original?
Or
Is David's Batch Processor maintain the original quality of the images after resizing?

Friend please help me to solve this problem.
I realy need to resize many images for my work.

pushkar.
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Jun 23, 2012, 16:22
Post: #2
RE: How to maintain the original quality of a image after resizing it?
You can use something like imagemagick on a command line. The command
identify -verbose filename.jpg
will provide a long listing of image properties.

Here is one before Daves Batch processor (lots chopped out)
Image: miki.jpg
Format: JPEG (Joint Photographic Experts Group JFIF format)
Class: DirectClass
Geometry: 2304x3072+0+0
Compression: JPEG
Quality: 99
exif:Compression: 6
Filesize: 2.084MB

This is after scaling (0.568 as posted) with DBP and quality set to 1.00
Image: dbpmiki.jpg
Format: JPEG (Joint Photographic Experts Group JFIF format)
Class: DirectClass
Geometry: 1290x1720+0+0
Compression: JPEG
Quality: 100
exif:Compression: 6
Filesize: 1.39MB

As you can see it does not prove very much since all that will be reported is what DBP/GIMP provides.
Logic says that you can not upscale from 99 to 100.
If you keep to a DBP quality setting of 1 probably as good as you will get.

** https://www.gimp-forum.net/ now answering questions**
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