Downsizing images

16 posts
30 Dec 2016
steves
Photographer
steves
From a non techie to all you techies out there!
Could you please explain how to reduce the size of a high resolution image (6mb) to a smaller size (2mb) in order to upload to a site where size is restricted.
Any help greatly appreciated.

Posted 30 Dec 2016
redbaron
Photographer
redbaron
Which editing programs are you most comfortable with Steve? Obviously there are dozens of ways to achieve this but there is little point explaining in say Photoshop to be told you only have lightroom

Posted 30 Dec 2016
Edited by redbaron 30 Dec 2016
PHP_Photography
Photographer
PHP_Photography
Didn't you get an answer on the other site ?

Posted 30 Dec 2016
RedChecker
Photographer
RedChecker
JPGMini is a program that seems to be the in-thing at the minute for compressing images without noticeable degredation (allegedly).

Adobe Lightroom has the facility to compress images to a particular size and obviously can batch-process (this is probably the best solution, especially since it can work from the RAW files).

Posted 30 Dec 2016
riddell
Photographer
riddell
As others have said the exact actions will of course depend on what application you are using, however -

To downsize you have a to balance 2 (or 3 (or 4 things))

Size and compression

and possibly file format (and possibly sub formats)

If we take out the file format options and just look at size and compression, then its all going to matter about where it is going and how that site displays it and of course who is going to download it.

You said you have 2mb to play with, which is actually quite a lot for regular internet .jpgs. If someone gave me that brief then I'd probably just resize, with a tiny bit of compression.

2mb could be quite slow to a lot of people on slower connections, phone etc. so for most internet sites I'd lower that right down, smaller size and more compression.

Right now I'm possibly confusing you with oblique answers when all you want is numbers to type in and buttons to press and a straight answer and wondering why I am not giving one?

Simple, there is no straight answer, not with .jpgs, it all depends on your subject matter as .jpgs use some clever packing algorithms. With exactly the same settings a file will end up different sizes dependant upon the content and how much detail there is. A cityscape with loads of buildings, windows and other architectural details has way more info in it that a model in a single colour plain outfit on a white background.






Posted 3 Jan 2017
Two_stops
Photographer
Two_stops
http://www.irfanview.com/main_download_engl.htm


One of the easiest apps to use is Irfanview, comes complete with batch processing, just go to advanced and set up the parameters you wish to use and away you go.

John


Posted 4 Jan 2017
MG
Photographer
MG
riddell
You said you have 2mb to play with, which is actually quite a lot for regular internet .jpgs. If someone gave me that brief then I'd probably just resize, with a tiny bit of compression. 2mb could be quite slow to a lot of people on slower connections, phone etc. so for most internet sites I'd lower that right down, smaller size and more compression. Right now I'm possibly confusing you with oblique answers when all you want is numbers to type in and buttons to press and a straight answer and wondering why I am not giving one? Simple, there is no straight answer, not with .jpgs, it all depends on your subject matter as .jpgs use some clever packing algorithms. With exactly the same settings a file will end up different sizes dependant upon the content and how much detail there is. A cityscape with loads of buildings, windows and other architectural details has way more info in it that a model in a single colour plain outfit on a white background.
The site will automatically downsize the image from 2mb. The original poster has a very fair point though.... These sites should not have a limit of 2mb per image. You should be able to load far larger images and then have them automatically resized. From memory the server software to do this always used to be ioncube... Might have that wrong but its a simple thing for a site to do...
Posted 5 Jan 2017
RedChecker
Photographer
RedChecker
MG

These sites should not have a limit of 2mb per image. You should be able to load far larger images and then have them automatically resized. From memory the server software to do this always used to be ioncube... Might have that wrong but its a simple thing for a site to do...


If you knew the costs of leased line bandwidth, you'd fully understand the logic of forcing users to resize before uploading, especially as JPGs can often reach tens of megabytes from modern cameras nowadays.

At work we've got a 50Mb leased line that's around £11k per year to run.  The costs for running sites that can handle hundreds, if not thousands of simultaneous users and still maintain a decent bandwidth must be absolutely eye-watering.
Posted 6 Jan 2017
Edited by RedChecker 6 Jan 2017
riddell
Photographer
riddell
MG

You should be able to load far larger images and then have them automatically resized.


Actually thats bad for 2 very good reasons.

1. Why would you want to upload a 10mb image only for it to get converted in a 100k? Uploading 100 of those is of course a gigabyte, instead of just 10mb for user resized images.

Not only is this slower for the user, it can also be a problem for people with limited usage accounts.

Plus perhaps even worse, its really bad for the people who own the websites. Its not just one person uploading the photos, its hundreds, it instantly means they need masses of extra bandwidth for both speed and usage.

2. Having a 3rd party system resize your images, means you have no control, no idea how that system is resizing them, what method its using or how its going to look. Just like everything else in photography, control is key. Automatic systems are left only to those who simply don't know what they are doing.


Posted 6 Jan 2017
steves
Photographer
steves
Thank you all for your help and advice. I'm now a fully fledged member of the resizing community!

Posted 7 Jan 2017
Moorlane
Photographer
Moorlane
can I ask what size videos need to be for uploading onto websites? Thanks John

Posted 8 Jan 2017
riddell
Photographer
riddell
Moorlane

can I ask what size videos need to be for uploading onto websites? Thanks John


OK, now thats an even more obteuse question.

The answer depends on loads of factors.

What is the length of the video?
What resolution?
What format?
and what codec?

When I shoot commercially I'm often asked to provide several formats. I'm sure you've noticed on many websites they have normal, HD and movile versions of the same video. Sometimes you can choose or override, but often these days the website will pick up what kind of equipment you are on and feed you the respective video that is best for your equipment.



Posted 11 Jan 2017


Ive heard you can pay for an app on the laptop for downsizing...there's a photographer who must know somewhere...espacially images sent to an email first

Posted 2 March 2017
PHP_Photography
Photographer
PHP_Photography
carolparry

Ive heard you can pay for an app on the laptop for downsizing...there's a photographer who must know somewhere...espacially images sent to an email first

No need to pay, there are plenty of free software like http://www.faststone.org/FSResizerDetail.htm




Posted 2 March 2017
AndyGStudios
Photographer
AndyGStudios
If you shrink the size, consider doing a little sharpen filter pass before you save. Some images lose clarity if they are complex in nature.

Posted 9 March 2017
To reply to this thread you must be a member. Click here to join