Why do my 13 mb raw files = 45mb in PS

Posted By
Oct 24, 2006
Views
336
Replies
5
Status
Closed
Hi,

My 8 mp camera produces about 13 mb Raw files. When I’m in bridge or ACR, it says they are 13 mb, but when I open them in PS, they are 45 Mb!

Why?

thanx in advance!
Related Tags
file

MacBook Pro 16” Mockups 🔥

– in 4 materials (clay versions included)

– 12 scenes

– 48 MacBook Pro 16″ mockups

– 6000 x 4500 px

RK
Rob_Keijzer
Oct 24, 2006
Your camera uses lossless compression, while viewed in PS, the uncompressed (displayed) size is shown.

Rob
Oct 24, 2006
thanx, so your saying this is normal? I’m a mere novice…can you explain what you mean. It’s an olympus e500. Are you saying that the image is still only 13 mb?? I’m lost?
AC
Art Campbell
Oct 24, 2006
The camera creates compressed files to maximize space on your storage media. Think of them as a .zip file or a StuffIt archive.

When you transfer the raw file and open the file on your computer in PS, it first uncompresses/expands the raw file and also converts it to a PS format.

Art
CC
Chris_Cox
Oct 24, 2006
Yes, it is normal.
Once decompressed and converted to RGB data, it will be larger in memory.

No, the IMAGE is 45 Meg (that’s how much memory it takes up). The COMPRESSED RAW FILE ON DISK is 13 Meg.
After conversion to RGB, the image may save to a new file (not RAW) between 25 and 45 Meg (depending on the file format and options you choose for compression).
RK
Rob_Keijzer
Oct 24, 2006
Well, it looks normal. There is a lossless way to compress data. your camera is doing that. (not a badd thing).

When you open this compressed file in Photoshop, it is decompressed and displayed. At this state its size is reported on the status bar.

Remember there is a difference between an on-disk file and a mapped, opened, parsed, unpacked picture in RAM.

Rob

Master Retouching Hair

Learn how to rescue details, remove flyaways, add volume, and enhance the definition of hair in any photo. We break down every tool and technique in Photoshop to get picture-perfect hair, every time.

Related Discussion Topics

Nice and short text about related topics in discussion sections