123Macmini.com
FAQFAQ   SearchSearch   MemberlistMemberlist   GalleryPhoto Gallery   RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

GREAT Price on "Aperture 3" in App. Store....BUT
Goto page Previous  1, 2
 
Post new topic   Reply to topic    123Macmini.com - Forums Forum Index -> General Software
View previous topic :: View next topic  
Author Message
billb
Veteran Member
Veteran Member


Joined: 18 Jan 2009
Posts: 1315
Location: USA

PostPosted: Tue Jan 25, 2011 12:13 am    Post subject: Why RAW? Reply with quote

When I modify am Image file
I tend to do it in stages. I
like to change something then
live with it for a while. Then change
something else, etc, etc, etc.

If I were to save my changes to a
format other than RAW then my Image
file would be compressed. RAW doesn't
compress the file. As far as I know, RAW
is the only Image file that isn't compressed.

You can make change, after change, after
change, and not suffer data loss by using
RAW. Thats why RAW is so popular.

TIFF or jpeg would be fine you only tweak
it a little bit and preferably once.
_________________
2011 Mac mini 2.7 GHz i7 with
16GB RAM, Samsung 512GB SSD
MacBook AIR 11 Inch
Mac mini, Model 1.1, 2.33 GHz C2D Proc
20" iMac G4 PPC
Back to top
View user's profile Send private message Visit poster's website
ez061111
Veteran Member
Veteran Member


Joined: 29 Mar 2009
Posts: 925

PostPosted: Tue Jan 25, 2011 12:19 am    Post subject: Reply with quote

I suggest you revisit your understanding. TIFF is non lossy if you chose the non-LZW options. If you save in 16 bit TIFF you'll have a large file, but without loss. Even PSD files are considered by some to rather lossless, but I usually don't save to that format unless I am pretty sure I'm not going to be making any serious changes. There is a PSD Raw format as well.

JPEG is lossy by definition.

RAW is what comes out of your camera, not a file format you save to.
_________________
2.0 GHz i7 Mini 8 GB RAM, OWC Merc Extreme SSD & Samsung Spinpoint
2.6 GHz i7 Mini 16 GB RAM, Samsung 830 & Hitachi
15" 2.3 GHz i7 MBP 16 GB RAM, OWC Extreme Pro 6G SSD & WD Black
Back to top
View user's profile Send private message
billb
Veteran Member
Veteran Member


Joined: 18 Jan 2009
Posts: 1315
Location: USA

PostPosted: Tue Jan 25, 2011 12:42 am    Post subject: Save as: RAW Reply with quote

Yah I get that, here's Wikipedia's RAW page
for those unfamiliar with RAW. The potential
problem as I see it is, once you "save as" a TIFF
or jpeg, its a compressed file. I don't want to make
changes then "save as" a TIFF, and then do
that several more times. Each time its saved
its compressed.

If you use Photoshop or Elements and make
changes then you can "save as" by using
Photoshops version of RAW which is .psd
which isn't compressed.

I hope I've explained that adequately.
_________________
2011 Mac mini 2.7 GHz i7 with
16GB RAM, Samsung 512GB SSD
MacBook AIR 11 Inch
Mac mini, Model 1.1, 2.33 GHz C2D Proc
20" iMac G4 PPC


Last edited by billb on Sat Jan 29, 2011 6:58 pm; edited 1 time in total
Back to top
View user's profile Send private message Visit poster's website
ez061111
Veteran Member
Veteran Member


Joined: 29 Mar 2009
Posts: 925

PostPosted: Tue Jan 25, 2011 12:47 am    Post subject: Reply with quote

Uh, well you are wrong. A 12 - 14 bit RAW file will contain less info than a 16 bit TIFF. If you use LZW compression in TIFF then it is compressed, otherwise, nope. You might want to reread your Wikipedia link. Also, if you trust Wikipedia, lookup TIFF.
_________________
2.0 GHz i7 Mini 8 GB RAM, OWC Merc Extreme SSD & Samsung Spinpoint
2.6 GHz i7 Mini 16 GB RAM, Samsung 830 & Hitachi
15" 2.3 GHz i7 MBP 16 GB RAM, OWC Extreme Pro 6G SSD & WD Black
Back to top
View user's profile Send private message
billb
Veteran Member
Veteran Member


Joined: 18 Jan 2009
Posts: 1315
Location: USA

PostPosted: Tue Jan 25, 2011 12:50 am    Post subject: TIFF Reply with quote

You know, a stupid old dog can still learn new tricks.
Here's Wikipedia's TIFF page. All these years I thought
TIFF compressed your file as opposed to just saving it.
_________________
2011 Mac mini 2.7 GHz i7 with
16GB RAM, Samsung 512GB SSD
MacBook AIR 11 Inch
Mac mini, Model 1.1, 2.33 GHz C2D Proc
20" iMac G4 PPC
Back to top
View user's profile Send private message Visit poster's website
ez061111
Veteran Member
Veteran Member


Joined: 29 Mar 2009
Posts: 925

PostPosted: Tue Jan 25, 2011 1:01 am    Post subject: Reply with quote

And some learning on my part, LZW appears to be lossless.
_________________
2.0 GHz i7 Mini 8 GB RAM, OWC Merc Extreme SSD & Samsung Spinpoint
2.6 GHz i7 Mini 16 GB RAM, Samsung 830 & Hitachi
15" 2.3 GHz i7 MBP 16 GB RAM, OWC Extreme Pro 6G SSD & WD Black
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    123Macmini.com - Forums Forum Index -> General Software All times are GMT - 5 Hours
Goto page Previous  1, 2
Page 2 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



      

Shop:  Apple Store  |  Refurbished Macs  |  Refurbished iPads  |  MacConnection  |  Mac Mini Vault  |  Other World Computing

MK 1 Studio Mac mini Racks  |  Crucial Mac Memory  |  Top Free Mac Apps  |  Top Paid Mac Apps



123Macmini.com is an independent publication and has not been authorized, sponsored, or approved by Apple Computer, Inc.
All logos and trademarks in this site are property of their respective owners.
Copyright © 2011 123Macmini.com. All Rights Reserved.