Can someone recommend settings?

XnConvert Multi Platform - Windows, MacOSX, Linux
Tec4
Posts: 5
Joined: Wed Aug 30, 2017 9:51 pm

Can someone recommend settings?

Postby Tec4 » Wed Aug 30, 2017 9:56 pm

I am trying to reduce the size of a cbz file by cracking it and then reducing the size of the jpegs inside. However, sometimes when I try to shrink the images they end up larger. For instance I set them to reduce to 50% of the original size using Lanczos but they end up being twice as large. So a jpeg that is 4MB in size will end up being 8MB in size after resizing.

Are there settings I can use that will result in a 50% exact reduction in size of all images when I set resize to 50%? Or am I missing something? I would like to reduce a jpeg from 4MB to 2MB without losing much in the way of image quality.

User avatar
XnTriq
Moderator & Librarian
Posts: 5104
Joined: Sun Sep 25, 2005 3:00 am
Location: Ref Desk

Re: Can someone recommend settings?

Postby XnTriq » Wed Aug 30, 2017 11:00 pm

Welcome aboard, Tec4.

Could you please upload a sample to a free file sharing host like Wikisend? (The forum's maximum attachment size is 2 MiB.)

Tec4
Posts: 5
Joined: Wed Aug 30, 2017 9:51 pm

Re: Can someone recommend settings?

Postby Tec4 » Wed Aug 30, 2017 11:20 pm

Thanks, I enjoy using the app. Do you want a sample of the resized image?

User avatar
XnTriq
Moderator & Librarian
Posts: 5104
Joined: Sun Sep 25, 2005 3:00 am
Location: Ref Desk

Re: Can someone recommend settings?

Postby XnTriq » Thu Aug 31, 2017 12:20 am

Tec4 wrote:Do you want a sample of the resized image?

Sorry, I should've been more clear: I'd like to do some tests on one of the 4MB originals so I can hopefully give you the best JPEG compression settings for your use case.

Tec4
Posts: 5
Joined: Wed Aug 30, 2017 9:51 pm

Re: Can someone recommend settings?

Postby Tec4 » Thu Aug 31, 2017 12:29 am

Couldn't get wikisend to work but here is a zippyshare file:

http://www55.zippyshare.com/v/XWezsmY4/file.html

User avatar
XnTriq
Moderator & Librarian
Posts: 5104
Joined: Sun Sep 25, 2005 3:00 am
Location: Ref Desk

Re: Can someone recommend settings?

Postby XnTriq » Thu Aug 31, 2017 12:45 am

Thanks for the sample. Please try the following settings:

144849_1.png

144849_2.png
144849_2.png (6.7 KiB) Viewed 167 times

144849_3.jpg

Tec4
Posts: 5
Joined: Wed Aug 30, 2017 9:51 pm

Re: Can someone recommend settings?

Postby Tec4 » Thu Aug 31, 2017 12:56 am

Wow that worked nicely. Although it ended up smaller than 50%. But smaller is actually better so I'll take it. Thank you!

User avatar
XnTriq
Moderator & Librarian
Posts: 5104
Joined: Sun Sep 25, 2005 3:00 am
Location: Ref Desk

Re: Can someone recommend settings?

Postby XnTriq » Thu Aug 31, 2017 1:15 am

Tec4 wrote:Although it ended up smaller than 50%. But smaller is actually better so I'll take it.

Here are the geeky stats in case you're interested ;-)

    Original
    Result
    • Dimensions: 1988×1528 pixels (50%)
    • Chroma subsampling: 4:4:4 (1×1,1×1,1×1)
    • Quality factor: 90
    • File size: 1'301'058 bytes

Tec4
Posts: 5
Joined: Wed Aug 30, 2017 9:51 pm

Re: Can someone recommend settings?

Postby Tec4 » Thu Aug 31, 2017 1:19 am

Interesting...thank you.


Return to “XnConvert”

Who is online

Users browsing this forum: No registered users and 6 guests