I've got my first vehicle wrap job looking like it's going to be confirmed. I recieved a file so I could run a small sample of it as a test to see how the resolution will look. The file provided is a photo in .psd format, in windows explorer it shows as a 20 meg file. When I open it in photoshop, & look under file size it shows as 10 megs.
thinking maybe something defaulted to a smaller size upon opening, I increased the image size at the same resolution until it showed as 20 megs in the "image size" dialog box. Then I saved this as a test & checked windows explorer where this test file shows 36 megs.
Anyone want to explain to me if this makes sense?
Posted by Mark Matyjakowski (Member # 294) on :
Are there layers? Lot's of layers could be a 20mb "psd" file but a 10mb image
Posted by Fred Weiss (Member # 3662) on :
From PhotoShop Help file:
quote: To track file size:
Check the values in the Document Sizes box at the lower left corner of the screen (Windows) or the image window (Mac OS). (See Displaying file and image information.) For more information on displaying file size, see Changing image size and resolution.
The first (left) value indicates the size of the file if flattened. The second (right) value shows the estimated file size of the unflattened file, including any layers and channels.
To track the use of the Photoshop scratch disk (temporary disk space used for storing data when RAM is insufficient), position the pointer over the triangle at the bottom of the image window, hold down the mouse button, and choose Scratch Sizes.
This may explain some of the difference. One will also get a different file size between a CD or Zip Disk, PhotoShop or a hard drive. It has to do with block and segments used between different storage media or calculation methods.
Posted by John Arnott (Member # 215) on :
Are you going to wrap an entire vehicle using the Gerber Edge printer?
Posted by Steve Aycock (Member # 3612) on :
A file open (resident in memory) and a file on disk are not the same file size.
Normally the open file is larger as it has been decompressed. Also different applications and even your operating system itself can calcualte file size differently depending on where and how you look at it. Sometimes it's calcualted in binary, one megabyte being real close to 1.44 million bytes. Sometimes a megabyte is calculated as one million bytes.
This is the information as best as I understand it and am able to cummunicate it to you. It is not necessarily 100% correct.
Anyone with more info or corrections to mine please post.
Hope that is help.
Steve
Posted by Scott Pagan (Member # 2507) on :
when you save as an *.eps, watch the file size grow triple (or more).
Posted by Doug Allan (Member # 2247) on :
Mark, nope, no layers. The .tif version also shows double the file size in explorer as the image size in photoshop.
Fred, I checked the info in the corner & it matches the lower size from explorer. I looked briefly into the help database, but did not laern anything relevant. I guess this may have always been the case with all my files & I just never noticed. I will be looking now. No big deal, my client just noticed when I opened his file & it made me think (& him too maybe ?) that I was screwing up & costing him some resolution somehow.
John, yes that is my plan.
Thanks everyone for your comments
Posted by Curtis hammond (Member # 2170) on :
The difference is the wording
bits = is one single piece of binary code either a 0 or a 1 Byte = 8 bits
Kilo bits = 1000 bits
Kilo bytes = 1024 bits
Now you get the idea.
Megabits = 1 million bits
Megabytes = 1 million bytes (multiples of 8 bits)
You have to compare apples to coem out even. Some progs use bits some use bytes. Thats the difference. Often manufacturers will try to mislead you.
One drive manufacturer says 65 (BITs) gig HD when it is actually only 55 (bytes) gigs
Posted by Steve Aycock (Member # 3612) on :
This is really only related to Curtis' post.
Along with that relevant info Curtis...
Drive manufacturers often advertise a drives unformatted capacity as opposed to formatted capacity. Unformatted is usually signifigantly larger.
Steve
Posted by Bill Cosharek (Member # 1274) on :
Doug,
Are you running an operating system with FAT32 which saves files in clusters of (I think) 4kb sizes or an NT which uses 64kb sizes? That could be the difference.
Posted by Doug Allan (Member # 2247) on :
I'm running windows 98. I don't know if that answers the question though. I remember the fat32 stuff coming up on a different machine when I had a guy setting up a partitioned HD for me. On this machine all I know about my OS is windows 98.
Posted by Bill Cosharek (Member # 1274) on :
If you're using w98 then that's not the problem unless FAT32 wasn't enabled, but it sounds like it was. Have nothing further to add here.
Posted by Bill Cosharek (Member # 1274) on :
Doug,
What size is your HD? How many gigs? Looking at a chart showing default cluster sizes with FAT32 enabled, shows file sizes still increase depending on the size of partition. This chart shows gigs not megs. This could very well be the source of your discrepency. If so, aint nothing you can do unless you partition drive down into smaller chunks.
Posted by Bill Cosharek (Member # 1274) on :
Sorry for double post. Did nothing to cause it to happen. Bullboard error.
[ April 23, 2003, 10:24 AM: Message edited by: Bill Cosharek ]
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