Tweaking a photo and saving shirnks the files size
Moderators: XnTriq, helmut, xnview
Tweaking a photo and saving shirnks the files size
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?
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
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:
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
Thanks for the welcome!!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?
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
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 ...
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
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:
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
- File » Save As... » Options takes you to
- XnView MP
- File » Format settings... » Write » JPEG
- File » Export... » JPEG
XnTriq ([url=http://newsgroup.xnview.com/viewtopic.php?p=34186#p34186]Lossless JPEG transformations[/url]) wrote:
- About.com – The Human Internet
Expert guidance from real people searching the Internet for the information, goods, and services that you need to know related to your passion
- Graphics Software
- Working with Digital Photos and Scanned Images
- Graphics File Formats and Types of Computer Graphics
- JPEG and JPEG 2000
- JPEG Myths and Facts: Page #1 + Page #2
The JPEG image format has quickly become the most widely used digital image format. It's also the most misunderstood. Here's a collection of some common misconceptions and facts about JPEG images.- The Pitfalls of JPEG Compression
JPEG compression makes your pictures nice and small so you can fit more on your storage card, but too much compression can damage them beyond repair. Your camera probably offers options to let you choose the best compromise between image quality and file size.
XnTriq ([url=http://newsgroup.xnview.com/viewtopic.php?p=100082#p100082]JPEG compression as lossless as possible[/url]) wrote:See also: Save JPG At 'Original' QualityXnTriq ([url=http://newsgroup.xnview.com/viewtopic.php?p=93079#p93079]Adjust-Automatic Levels / filesize[/url]) wrote:The problem with this setting ...
... is that XnView only takes the compression level (“Q factor”) into account, ...
- Tools » Options » General » Read/Write » Write » JPEG » Parameters » Use estimated original quality if possible
... but ignores other criteria such as chroma sub-sampling.Calvin Hass ([url=http://www.impulseadventure.com/photo/jpeg-compression.html]JPEG Compression, Quality and File Size[/url] » Where does the error come from?) wrote:By far the biggest contributor to the error (ie. file size savings) in the JPEG algorithm is the quantization step. This is also the step that allows tuning by the user. A user may choose to have a slightly smaller file while preserving much of the original (ie. high quality, or low compression ratio), or a much smaller file size with less accuracy in matching the original (ie. low quality, or high compression ratio). The tuning is simply done by selecting the scaling factor to use with the quantization table.
Calvin Hass ([url=http://www.impulseadventure.com/photo/jpeg-compression.html]JPEG Compression, Quality and File Size[/url] » Where does the error come from?) wrote:The act of rounding the coefficients to the nearest integer results in a loss of image information (or more specifically, adds to the error). With larger quality scaling factors (ie. low image quality setting or high numbers in the quantization table), the amount of information that is truncated or discarded becomes significant. It is this stage (when combined with the Run Length Encoding that compresses the zeros) that allows for significant compression capabilities.
There are other contributors to the compression error, such as the color space conversions, but the quantization step is the most important.
Re: Tweaking a photo and saving shirnks the files size
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
cday's step-by-step tutorial for uploading attachmentsDoubleD wrote:I'd up load an image if I knew how ...
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?DoubleD wrote:What is a good setting for this parameter where the photo is not compromised and some space is saved?
Did you activate Use estimated original quality if possible?
Re: Tweaking a photo and saving shirnks the files size
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
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
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: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).
Create » Web Page... allows you to generate HTML galleries, but I don't think that any of the templates offer a built-in slideshow.DoubleD wrote:Can XnView create a slide show that I can put on a web site?
Have you tried Create » Slide Show... » Create Video..?
Re: Tweaking a photo and saving shirnks the files size
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.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
All I see is
Re: Tweaking a photo and saving shirnks the files size
It's well hidden in File > Format settings... , a current issue Pierre is trying to resolve.DoubleD wrote:I don't see the screen you pasted into this reply on XnViewMP version Version 0.72 x32 (Dec 19 2014).
Sorry to intrude...
Re: Tweaking a photo and saving shirnks the files size
Yes, my screenshot is from XnView “Classic” (v2.34).
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.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
L Lcday wrote:Sorry to intrude...
Re: Tweaking a photo and saving shirnks the files size
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
Oh, I didn't realize that Format settings... is only available in the viewer's File menuDoubleD wrote:I don't have a files, Format options or I don't know how to get to it
You have to open an image to get there.
Re: Tweaking a photo and saving shirnks the files size
Hello again:DoubleD wrote:I don't have a files, Format options or I don't know how to get to it