Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: Why Massive Difference ...

4 Weeks Ago   #1
MourningStar

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
 
 
Why Massive Difference ...

... in size of these two image files?!!??!!!!

They are almost identical in pixel (2850x2850) & dpi(600) & bit depth (24). I frequently encounter this phenomenon and I finally want to know how to make the larger file to be similar in size to the smaller one.
(could it possibly the 'information' in the image itself?)

Note : On my system CD.jpg is 4.25 MB and CD_Back.jpg is 762 KB.




Attached Thumbnails
Why Massive Difference ...-cd.jpg   Why Massive Difference ...-cd_back.jpg  
My System SpecsSystem Spec
.
4 Weeks Ago   #2
Alejandro85

Windows 7 Ultimate x64
 
 

Simply because the two images are massively different (in terms of content) and you're using a compressed image format (jpg).

Jpg, as well as any other compressed formats, store images not pixel-by-pixel, but by compressing it so that they occupy as little as possible, but compression algorithms have better results when the source has a lot of repetitions and is as uniform as possible. The top image has lots of small details, texts, prints and small variations all over the place, while the bottom one is pretty simplistic in that aspect, hence the file size difference.

On the other hand, if they were saved as .bmp (an uncompressed file format), they would have exactly the same file size, down to the byte (provided they're the same resolution and bit-depth).

This is exactly the same reason why standard compression programs (likie WinZip, WinRar and the like) obtain far better compression ratios on text files rather than on binary files. Text files use few characters, with certain repeating patterns, while binary files use the full byte range with some unpredictable contents, resulting in higher final file sizes.
My System SpecsSystem Spec
4 Weeks Ago   #3
MourningStar

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
 
 

thank you Alejandro85 for confirming my suspicion.
My System SpecsSystem Spec
.

4 Weeks Ago   #4
DavisHill

Windows 10 64
 
 

Alejandro85 explained it. We usually open and save as .jpg any photos to reduce the bytes capacity.
My System SpecsSystem Spec
Reply

 Why Massive Difference ...




Thread Tools




Similar help and support threads
Thread Forum
Massive depreciation on RAM?
So I'm gonna sell my Kingston 2GB DDR3-10600 CL9 240-Pin DIMM since it's not compatible with my system. I found a local shop, but the person will buy it for only $4.47 (₱200); it's original price is $33.55 (₱1500). That's around 86.66% value reduction. The usage time of less than 20 minutes. Why?...
Hardware & Devices
Massive HDD lag
Hello. Since i have some problems with my hdd I would like to ask you for some optimization advice. Currently I am running Windows 7 Ultimate Sp1 64bit operating system with latest drivers (altough not latest BIOS). Sometimes my hdd lags very badly, by that, I mean it is overloading. It is very...
Performance & Maintenance
Massive mbr issue
Ok so basically everything went pear chaped when i installed ubuntu long story short the only thing that will install on my pc is ubuntu i have a feeling the mbr is buggered and i need to compleyley obliterate everything on my hard drive so i can just install windows is there any way i...
Installation & Setup
Is There a Massive Difference Between..................
The Intel Graphics Media Accelerator X4500HD, and the 256MB ATI Mobility Radeon HD4330, for the Dell Inspiron 1545? And I mean not when I'm watching movies, or using photoshop, or playing games, as I don't use my laptop for those...well at least, not blu-ray movies. I watch DVDs only on this...
Hardware & Devices
Massive issues with RTM x64
Having installed the x64 RTM build of Windows 7 I am experiencing fairly severe crashing and frequent errors. Firstly, my specs are as follows: Gigabyte GA-P35-DQ6 motherboard Intel Pentium D 2.8GHz processor :o 3GB DDR2 memory :o ATI Radeon HD 2600 PRO graphics Creative XiFi Xtreme Music...
Software


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 11:06.
Twitter Facebook