Approve the Cookies
This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and our Privacy Policy.
OK
Index  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Guest
New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Register to forums    Log in

 
FORUMS Post Processing, Marketing & Presenting Photos RAW, Post Processing & Printing 
Thread started 25 Jan 2014 (Saturday) 10:21
Search threadPrev/next
sponsored links
(this ad will go away when you log in as a registered member)

DPP cropped image file size much bigger than original. Why?

 
colintf
Senior Member
295 posts
Likes: 2
Joined Apr 2012
Location: Bristol, UK
     
Jan 25, 2014 10:21 |  #1

Hi,
Played with DPP today cropping some JPEG images

What I don't understand is why the cropped image has a much bigger file size than the original say 4Mb vs 1.6 for example

Any ideas?
What am I doing wrong?

Many thanks
Cheers
Colin




  
  LOG IN TO REPLY
tzalman
Fatal attraction.
Avatar
13,439 posts
Likes: 177
Joined Apr 2005
Location: Gesher Haziv, Israel
     
Jan 25, 2014 11:06 |  #2

Because at its highest quality setting DPP compresses jpgs much less than the camera. The camera has only two compression levels, one is equal to DPP 7-8 and the other 3-4. DPP 10 makes for larger files.


Elie / אלי

  
  LOG IN TO REPLY
BigAl007
Cream of the Crop
7,913 posts
Gallery: 542 photos
Best ofs: 1
Likes: 1578
Joined Dec 2010
Location: Repps cum Bastwick, Gt Yarmouth, Norfolk, UK.
     
Jan 25, 2014 11:15 |  #3

When you save the cropped image DPP starts all over again using the JPEG file compression system, as if the image had never been compressed before. If you have the maximum image quality/ largeest file size selected then the resulting file will be much bigger. Although you have set the image quality to maximum the "damage" that file compression does to the image quality from the initial smaller file size is still there and cannot be undone.

When editing JPEG files it is always best to create a copy when you save so that you still have the original file, good if you change your mine on the edits you have done. Every time you open a JPEG file, edit it and then simply re-save it you will reduce the quality of the file, as the compression system is run on the data each time, slowly adding to the "damage" each time.

Do not worry unnecessarily as the damage from doing it just once is usually pretty negligable, and usually needs a trained eye to see.

Alan


My Flickr (external link)
My new Aviation images blog site (external link)

  
  LOG IN TO REPLY
tzalman
Fatal attraction.
Avatar
13,439 posts
Likes: 177
Joined Apr 2005
Location: Gesher Haziv, Israel
     
Jan 25, 2014 11:27 |  #4

colintf wrote in post #16635616 (external link)
Hi,
Played with DPP today cropping some JPEG images

What I don't understand is why the cropped image has a much bigger file size than the original say 4Mb vs 1.6 for example

Any ideas?
What am I doing wrong?

Many thanks
Cheers
Colin

You didn't say what camera you have, but if it's one of the current 18 MP models its 8 bit image without compression would be around 50 MB, so if you are getting 1.6 MB jpgs that is an awful lot of compression.


Elie / אלי

  
  LOG IN TO REPLY
colintf
THREAD ­ STARTER
Senior Member
295 posts
Likes: 2
Joined Apr 2012
Location: Bristol, UK
     
Jan 25, 2014 12:25 |  #5

[many thanks guys :cool:


QUOTE=tzalman;16635786​]You didn't say what camera you have, but if it's one of the current 18 MP models its 8 bit image without compression would be around 50 MB, so if you are getting 1.6 MB jpgs that is an awful lot of compression.[/QUOTE]


I was cropping an already cropped image :cool:




  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)

1,044 views & 0 likes for this thread
DPP cropped image file size much bigger than original. Why?
FORUMS Post Processing, Marketing & Presenting Photos RAW, Post Processing & Printing 
AAA
x 1600
y 1600

Jump to forum...   •  Rules   •  Index   •  New posts   •  RTAT   •  'Best of'   •  Gallery   •  Gear   •  Reviews   •  Member list   •  Polls   •  Image rules   •  Search   •  Password reset

Not a member yet?
Register to forums
Registered members may log in to forums and access all the features: full search, image upload, follow forums, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, all settings, view hosted photos, own reviews, see more and do more... and all is free. Don't be a stranger - register now and start posting!


COOKIES DISCLAIMER: This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and to our privacy policy.
Privacy policy and cookie usage info.


POWERED BY AMASS forum software 2.1forum software
version 2.1 /
code and design
by Pekka Saarinen ©
for photography-on-the.net

Latest registered member is cccx3
858 guests, 393 members online
Simultaneous users record so far is 6430, that happened on Dec 03, 2017

Photography-on-the.net Digital Photography Forums is the website for photographers and all who love great photos, camera and post processing techniques, gear talk, discussion and sharing. Professionals, hobbyists, newbies and those who don't even own a camera -- all are welcome regardless of skill, favourite brand, gear, gender or age. Registering and usage is free.