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Tweaking a photo and saving shirnks the files size
Posted: Mon Sep 21, 2015 4:45 pm
by DoubleD
I tried xnView and XnViewMP. I may rotate a photo or crop it and I noticed that when I save my changes the file's size is drastically reduced
2,000kb down to 600kb
Does this mean that tweaking a photo and saving it will reduce the photo's quality and characteristics. Why does the size shrink so much?
Re: Tweaking a photo and saving shirnks the files size
Posted: Mon Sep 21, 2015 8:00 pm
by XnTriq
Welcome to the forum, DoubleD.
If you crop a photo, image data is discarded which leads to smaller file size.
What format (JPEG, PNG, GIF, …) are we talking about?
Related topics:
Re: Tweaking a photo and saving shirnks the files size
Posted: Mon Sep 21, 2015 8:21 pm
by DoubleD
XnTriq wrote:Welcome to the forum, DoubleD.
If you crop a photo, image data is discarded which leads to smaller file size.
What format (JPEG, PNG, GIF, …) are we talking about?
Thanks for the welcome!!
They are .JPG files. I can see a little smaller but not this much. I just opened a file did noting to it and selected save as JPEG/JFIF). The file size went from 2093 KB down to 552 KB ?
Re: Tweaking a photo and saving shirnks the files size
Posted: Mon Sep 21, 2015 8:35 pm
by DoubleD
Oh maybe I found it
You have to set out to best on the options "write tab" for JPEG
I'd up load an image if I knew how ...
Well I tried that and the resulting file is bigger but still much smaller that the original
Re: Tweaking a photo and saving shirnks the files size
Posted: Mon Sep 21, 2015 8:45 pm
by XnTriq
Unfortunately, JPEG is a very complex format and tricky to deal with.
This is where you'll find the settings for saving (and re-saving) JPEGs:
- XnView Classic
- File » Save As... » Options takes you to
Tools » Options... » Read/Write » Write » JPEG
- File » Export... » JPEG
- XnView MP
- File » Format settings... » Write » JPEG
- File » Export... » JPEG
Re: Tweaking a photo and saving shirnks the files size
Posted: Mon Sep 21, 2015 8:57 pm
by DoubleD
DoubleD wrote:Oh maybe I found it
You have to set out to best on the options "write tab" for JPEG
I'd up load an image if I knew how ...
Well I tried that and the resulting file is bigger but still much smaller that the original
Oops I goofed - Tools, Options, Write tab, highlight/choose JPEG and setting quality top BEST actually makes the resulting file as big or even a little bigger.
OK for someone who has no clue (me) - What is a good setting for this parameter where the photo is not compromised and some space is saved?
Re: Tweaking a photo and saving shirnks the files size
Posted: Mon Sep 21, 2015 9:15 pm
by XnTriq
DoubleD wrote:I'd up load an image if I knew how ...
cday's step-by-step
tutorial for uploading attachments
DoubleD wrote:What is a good setting for this parameter where the photo is not compromised and some space is saved?
It depends on what you're planning to do with the result. Are you going to use it in desktop publishing (e.g. MS Word), upload it to the web, send it via e-mail, or will it be an archival copy?
- My default settings
Did you activate
Use estimated original quality if possible?
Re: Tweaking a photo and saving shirnks the files size
Posted: Mon Sep 21, 2015 9:26 pm
by DoubleD
Cool on the tutorial - I didn't see that upload tab on the bottom - Every forum is so different
Yes I did tick the estimated original quality if possible it comes close but pushing it to best gives the closest to original (for my simple test anyway).
I want to upload the photos to a private cloud where I will share to others so they can print and or make a slide show for themselves.
The printing and making a slide show I would guess the closest to the original size the better (they my crop and zoom)
If putting on a website and or maybe a web slide show then the smaller the better
I will have to play with it and maybe have two areas - one for full bore file and one for website use.
Can XnView create a slide show that I can put on a web site? - I know the question is morphing I'm sorry
Re: Tweaking a photo and saving shirnks the files size
Posted: Mon Sep 21, 2015 10:00 pm
by XnTriq
DoubleD wrote:Yes I did tick the estimated original quality if possible it comes close but pushing it to best gives the closest to original (for my simple test anyway).
As mentioned in my previous post, “the problem with this setting is that XnView only takes the
compression level (‘Q factor’) into account, but ignores other criteria such as
chroma sub-sampling.”
Both parameters have an influence on quality and file size.
DoubleD wrote:Can XnView create a slide show that I can put on a web site?
Create »
Web Page... allows you to generate HTML galleries, but I don't think that any of the templates offer a built-in slideshow.
Have you tried
Create »
Slide Show... »
Create Video..?
Re: Tweaking a photo and saving shirnks the files size
Posted: Tue Sep 22, 2015 3:48 pm
by DoubleD
DoubleD wrote:Cool on the tutorial - I didn't see that upload tab on the bottom - Every forum is so different
Yes I did tick the estimated original quality if possible it comes close but pushing it to best gives the closest to original (for my simple test anyway).
I want to upload the photos to a private cloud where I will share to others so they can print and or make a slide show for themselves.
The printing and making a slide show I would guess the closest to the original size the better (they my crop and zoom)
If putting on a website and or maybe a web slide show then the smaller the better
I will have to play with it and maybe have two areas - one for full bore file and one for website use.
Can XnView create a slide show that I can put on a web site? - I know the question is morphing I'm sorry
I don't see the screen you pasted into this reply on XnViewMP version Version 0.72 x32 (Dec 19 2014). It is in XnView version 2.33. The file size get drastically reduced when using save as. I did find the Export setting and bumped that up to best and if I export the file the size is at lease as big or bigger.
All I see is
Re: Tweaking a photo and saving shirnks the files size
Posted: Tue Sep 22, 2015 4:49 pm
by cday
DoubleD wrote:I don't see the screen you pasted into this reply on XnViewMP version Version 0.72 x32 (Dec 19 2014).
It's well hidden in
File > Format settings... , a current issue Pierre is trying to resolve.
Sorry to intrude...
Re: Tweaking a photo and saving shirnks the files size
Posted: Tue Sep 22, 2015 5:00 pm
by XnTriq
Yes, my screenshot is from XnView “Classic” (v2.34).
XnTriq wrote:
This is where you'll find the settings for saving (and re-saving) JPEGs:
- XnView Classic
- File » Save As... » Options takes you to
Tools » Options... » Read/Write » Write » JPEG
- File » Export... » JPEG
- XnView MP
- File » Format settings... » Write » JPEG
- File » Export... » JPEG
If cropping and/or rotating is all you're gonna do with your photos, you can avoid so-called “
generation loss” by using
Tools »
JPEG lossless transformations.
cday wrote:Sorry to intrude...
L
L
Re: Tweaking a photo and saving shirnks the files size
Posted: Tue Sep 22, 2015 5:13 pm
by DoubleD
I don't have a files, Format options or I don't know how to get to it
Re: Tweaking a photo and saving shirnks the files size
Posted: Tue Sep 22, 2015 5:23 pm
by XnTriq
DoubleD wrote:I don't have a files, Format options or I don't know how to get to it
Oh, I didn't realize that
Format settings... is only available in the viewer's
File menu
You have to open an image to get there.
Re: Tweaking a photo and saving shirnks the files size
Posted: Tue Sep 22, 2015 5:24 pm
by cday
DoubleD wrote:I don't have a files, Format options or I don't know how to get to it
Hello again: