image size so much smaller after editing?


Feb 6, 2006
461
0
16
sINgaPoRe
#1
I had edited an original jpg file 5.61mb without cropping, just change the brightness.
when I saved the image, it became 1.58mb.
Image was saved as 8 high quality jpg.
why such a big loss in size?
thanks
 

ricleo

Senior Member
Mar 13, 2004
6,570
30
48
Eastern Singapore
#2
compression in the JPEG.. i wld normally save with a minimum of quality 10 for JPEG haaha...but that's still compression too :p
 

allenleonhart

Deregistered
Sep 17, 2008
3,656
0
0
#3
compression in the JPEG.. i wld normally save with a minimum of quality 10 for JPEG haaha...but that's still compression too :p
:bsmilie: i save as 12. baseline optimized
 

catchlights

Moderator
Staff member
Sep 27, 2004
21,903
46
48
Punggol, Singapore
www.foto-u.com
#4
compression as in discard data, higer the compression more data is discarded.
and if your image has very simple background, or not having lot of details, physical file size will be smaller, eg, a glass of water against plain color background vs night cityscape of Orchard Road.
 

mayhemics

New Member
Apr 28, 2009
763
2
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#5
yeah the file size diff betw 8 and 10, and 10 and 12, are not all that proportionate...
 

Feb 6, 2006
461
0
16
sINgaPoRe
#6
i normally shoot incamera highest jpg quality.
looks like cannot edit if need big file for printing
if i shoot in raw and convert to jpg, will it be just as small?
 

giantcanopy

Senior Member
Feb 11, 2007
6,232
2
0
SG
#7
Your brightening might have caused less details needed to be recorded, and the jpg compression is lossy.

But still quite a drop i must say

ryan
 

jopel

Senior Member
Dec 21, 2004
1,175
1
0
#8
i normally shoot incamera highest jpg quality.
looks like cannot edit if need big file for printing
if i shoot in raw and convert to jpg, will it be just as small?
you should start shooting raw than jpg. Raw file give you more details for post processing. Upon converting to the highest quality jpg the file size will be reduced by 50% or so. File size is relative to the info (color, bit depth, saturation), dimension and resolution of the image.
 

grantyale

Senior Member
Oct 4, 2004
1,798
0
36
Bedok
#9
Photoshop Quality=8 drops a lot of information already.
 

Feb 6, 2006
461
0
16
sINgaPoRe
#10
even if we shoot at 21mp RAW after conversion to Jpg only get 50% left :eek:
any solution to capture 21mp and print in its full glory :think:
 

jopel

Senior Member
Dec 21, 2004
1,175
1
0
#11
even if we shoot at 21mp RAW after conversion to Jpg only get 50% left :eek:
any solution to capture 21mp and print in its full glory :think:
save as tiff or psd file - it will be bigger than 21MB after all the post processing.
 

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