Image dimensions and file size, why the change?

Here's a Friday puzzler for ya
I just ran a batch on a couple of thousand orthophoto images (RGB + 1 alpha channel geo-tif) to add some typographic information to the bottom of each image. All the files were saved in PS as flattened, standard uncompressed tif. EVERY image is 10k x 10k pixels. After the process we noticed that the new set of files were consistently smaller than the original images! Not by much mind you, but with this kind of spatially mapped imagery it makes you wonder if we are missing anything:
before: 720013700.tif = 381 MB = 390,704kb (400,080,750 bytes), size on disk 381 MB (400,080,896 bytes)
after: 720013700_DRAFT.tif = 381 MB = 390,648kb (400,023,280 bytes), size on disk 381 MB (400,023,552 bytes)
So my supervisor asks "why"? and that leads me here. I thought about a few answers - 1) pixel values changes for white text take up less space? 2) No geo-tif header information written back to the file (that's a separate step after the PS batch using another app), so we'll know about that one. 3) Bit fairies took the 56kb.
Any ideas?

You say uncompressed… So you didn't select any compression at all during the save of the TIFF files? If not, white text replacing image data couldn't have changed the size by itself.
You mentioned geo-tif header information... Was this header in the file before you opened it with Photoshop?
I don't really know the internal format of a TIFF file; perhaps Chris Cox can say something about this.
-Noel

Similar Messages

Pixel Dimensions and File Size

Can anybody please explain the relation between pixel dimensions and file size?
Being naive, (or straight-forward if you prefer) I had assumed that pixel dimensions wide times pix dimension high = file size. Wrong!
For instance a .JPG file 374 X 500 has a file size of 41,275 bytes. But 374 times 500 = 18,700 so the two are different issues.

Thanks Rich. It kind of sounds like you know something about this.
I see 1 pixel, and 24 bit color would make 24 bits at 8 bits to a byte, so there's the 3 bytes.
I selected a certain photo and used the APPLE i command to see if could find if it had 8 bit color or, whatever. That infomation was not on the info function, but it did say something about RGB color profile.
Is 8 bit color a near certain bet in most applications, or was that just for the sake of illustration?
I Googled 8 bit color and go to a Wikipedia Article
http://en.wikipedia.org/wiki/Color_depth
which explained a lot, but its more technical depth than what I'm prepared to deal with. The net net, as far as I can tell is that image size (before compression) is dimension times color depth in its native mode, but I suppose what the native mode is and what the displayed mode is could be separate issues?
I was under the impression that the compression in JPG formt files comes out, or is decompressed, when the photo is printed or displayed? No?

Reduce image quality (and file size)

Is there a simple way to reduce the quality of all backgroung
images ? (there are all bitmap images, about 3 MB each of them)
I imagine that by reducing the image quality, the file size
will be less huge...
But I wasn't able to find a way to do that...
(the option about JPEG quality in project/preferences has no
effect, because all background images are bitmap... )
Any idea is welcome !
Valérie

Hi Valerie
I have been doing some research on this -- the issue of file
size (relating to both .cp and .swf) crops up a lot on this forum,
so I wanted to find out which were the critical factors relating to
images.
My findings show that there are two critical factors:
-- Slide Properties: Quality (High, Standard, JPEG,
Optimized)
-- Format of original image file (used for slide background
or inserted image object)
To summarize the results of my testing:
Slide Quality
Changing the slide quality from High
to Standard or JPEG makes little or no difference to the size of
the .cp file but can *significantly* reduce the size of the
.swf
This is an especially useful way of
dealing with the very large .swf file sizes caused by importing PPT
slides
A .swf consisting entirely of
imported PPT slides with complex backgrounds may be reduced to less
than 10% of its original size by changing the quality setting for
each of the slides to JPEG and using a JPEG image quality setting
of 75%.
Format of original image file
For complex images such as photos,
the best image file format to use is (oddly) .bmp -- although it
results in a larger .cp file than other file formats (such as .jpg
or .png), it generates the smallest .swf output.
The benefit of using the .bmp format
is less marked if you have set slide quality to Standard instead of
High, but it can still cut the file size of the .swf output by up
to 50%
For slides using a quality setting of
JPEG, there appears to be no difference in resulting .swf file size
between .bmp or any other image file format
A final comment: it is interesting to compare the size of the
.cp and resulting .swf for different Captivate projects. There is
typically an assumption that the .swf file will be smaller due to
compression. However, this is not always the case. For example, I
tested one project that used High slide quality and images that had
been inserted from .jpg files -- the generated .swf file was over 4
times larger than the .cp file. However, when I changed the quality
setting for all slides to JPEG, the .swf file reduced to less than
50% of the size of the .cp file.
I hope this information is helpful -- please contact me if
you'd like to see the detailed test data.
Best regards,
-Matthew Ellison

InDesign Transparency Effects - Problems with Image Quality and File Size

Hello,
We are experiencing new problems exporting InDesign files to PDF.
To summarize, though our largest workflow is to create files for offset printing, we also deliver our work to PDF for mounting on a website so our clients can download directly from the web. Our new problem is Transparency Effects, and creating a PDF that will both have a high quality (or resolution), and be a small file size.
We are working with multiple page documents (24 to 48 pages), and would very much like to work with InDesign Transparency Effects. However, after spending much time testing a variety of PDF types, we are finding there is a radical difference between quality and file size. I was curious if anyone has had these problems, and if there is a simple answer. InDesign is an incredible program that allows us to design on the fly with Transparency Effects, but, if we are going to experience these problems, we will have to eliminate these wonderful tools.
Can you help me or lead me to information online that will help.
Thank you,
Lain

Please don't post in multiple forums. Your question has nothing to do with the PDF language and specifications, but rather PDF workflow or InDesign. I've responded to your other posting and am closing this thread.
- Dov

Shedding light on export settings and file size

I am trying to learn about exporting images and file size. I have a combination of RAW and JPEG images in my library. For the sake of this discussion, I am going to limit this to JPEG's. I need to export my images, so that I can then upload them to an external photo processing site like Kodak.com. I was going to export versions of my images because I have made adjustments to many of them. I was going to choose the top level preset of "JPEG - original size." For the sake of example, the file that I try exporting this way has a file size (in Aperture) of 1.94 MB. After exporting it (with a DPI of 72) and a color profile of sRGB IEC61966-2.1 (I am not sure what the significance of the DPI and color profiles are either), I get an exported image with a file size of 4.6 MB. When I export the master image, I get a file size of 2.0 MB. I'm completely confused and at a loss as to what is going on here.
Can someone please shed some light on how to go about exporting images so that I can be certain that I am exporting the best quality image possible.
Also, and possibly more importantly, I export image files to sites like MobileMe Galler, Flikr and Phanfare, etc, for the purpose of archiving my images and now I am not sure if the files I am exporting are of the optimal most quality they can be. Do these settings have any bearing on the images that are being sent to my archival folders?
Thanks in advance for any input on this important topic.
Mac

This confusion is because of the way Jpg files handle data. Jpg is a kind of file that compresses data to achieve a balance between image quality and file size. The jpg file that your camera saves to disk is also compressed, that's why the difference in size between a 2 MB jpg and the same image in Raw is for example 18 MB.
Jpg is a lossy compression format, every time you save a jpg some compression is applied, say after editing in Photoshop. Aperture must be reading your jpg masters to export jpg files to disk, so the difference in size should be the compression quantity applied to the newly created jpg file. I could have a 1 MB jpg file previously compressed with a quality level of 7, but if I export it at a compression quality of 10, the file could easily become a 2 MB file. The problem is quality doesn't increase with file size when the original file is a jpg.
Also some files include a preview image inside the file, increasing the final file size. The color profile embedded should't increase size by much, since most camera jpg files already include a color profile embedded (color profiles tells computers to display color consistently between applications and peripherals like printers. sRGB is widely used for images published on Internet).
As for the images you are sending to the archival folder, I would suggest you to export the masters, instead of exporting a new jpg file from an already compressed jpg master.
I know this is a complex subject so I hope I haven't confused you.

How do I show file size in the Finder icon view for images?

How can I add the file size to the icon view "File Info" for images?
I know how to get it to display the image size under View Options. In this mode it shows pixel dimensions for some images (not for svg or pdfs tho) and file size for some non-images (rar, zip, but not txt or plain text files).
Is there some plist I can modify?

Just found the answer in a post with this subject:
How Do I Change the Mailbox Font Size in the Sidebar?

Why is "Reduce File Size" in the "File" menu always disabled?

I have a rather large presentation file, about 100Mbyte, and Keynote has become almost impossible to use, because it has become so slow.
Have to wait about 5 seconds for each letter to appear on screen after typing! Almost impossible to use Keynote under these conditions.
So I tried to use "Reduce File Size" to reduce the presentation file size by compressing the images, but "Reduce File Size" is always disabled!
Anybody else having such problems?
Gerhard

OK, sounds like memory will be fine, so let's look at some other stuff...
Is it only one particularly keynote presentation that slows up for you, or does keynote behave in the same way even if you start from scratch and create a new presentation?
If it's just the one presentation then there's probably some content (possibly video) within it that KN takes exception to. Sometimes a single problematic slide or piece of content can slow down the whole app.
Is the problematic presentation one that was imported from Powerpoint? If so, import it again and look carefully at the import error/warning logs.
Before you start keynote, start up activity monitor - which will give you an indication of what programs are using all the CPU/memory/disk bandwidth etc. You'll then have an idea of whether it is KN maxing out on CPU or whether anything else is dragging the system down.
Another thing you could try would be to log in to a different user account on your machine (create one if necessary) and then try opening the presentation from within this different account. If this works for you then it suggests a problem with the keynote plist file in your original user account.
I don't know if it'd be acceptable to you, but if you could post a link to your problematic presentation then I could download it and try it out on my normally reliable Keynote on one of my computers. (Make sure that you've ticked the box to embed all media in the presentation)
Hope some of this is helpful,
Mike.

Why do copied files show different file sizes than the original files?

When I copy files (to another drive, folder, etc.) some show the same file size as the original, but others don't.
I'm guessing this is not abnormal, but what causes it?
Thanks.

Hi dymar,
Copying to another Drive is understandable, they may have a differentnumber of Blocks allocated per file, for insnce a one Byte file might take up 512 bytes, 1024 Bytes, etc, but a Get info should show the actual size of the file within that/those blocks.
If copying to another Format, like MS-DOS, Forks may be lost also.
There are ways to actually Compare the files...
http://www.hutsby.net/2008/01/apple-mac-osx-compare-files-and-folders.html
http://www.deltopia.com/compare-merge-sync/macosx/
http://www.macworld.com/article/49584/2006/03/cmpfldr.html
http://www.araxis.com/merge_mac/index.html
Or the most expensive one & my favorite, but far more useful, Tri-Backup...
http://www.tri-edre.com/english/tribackup.html

Audio bit rate (kbps) and file size balance

I'm new to Flash, and I'm trying to decide how to set the bit
rate (kbps) for my audio files.
I'm creating PowperPoint-like presentations with voice audio.
You can see what I'm doing at
http://preparatorychemistry.com/Bishop_Audio_Book.htm
I first decided on 16 kbps, but I'm not happy with how it
sounds, especially through headphones connected to the computer. My
presentations, of course, sound better with higher bit rates, but
file sizes roughly double for each doubling of the bit rate. At 16
kbps, my files range from 1-3 MB, so for 32 kbps (which I'm leaning
toward now), they are 2-6 MB. My questions are
What's the concensus on the best bit rate for Internet sound
files, especially voice?
How important is it to minimize files size? The files are
already large enough so that dial-up folks will probably not listen
to them, and even the larger files seem to download fast enough
with my cable connection.
Thanks for the help.
Mark

Chemistry guy wrote:
> I'm new to Flash, and I'm trying to decide how to set
the bit rate (kbps) for
> my audio files.
>
> I'm creating PowperPoint-like presentations with voice
audio. You can see what
> I'm doing at
>
>
http://preparatorychemistry.com/Bishop_Audio_Book.htm
>
> I first decided on 16 kbps, but I'm not happy with how
it sounds, especially
> through headphones connected to the computer. My
presentations, of course,
> sound better with higher bit rates, but file sizes
roughly double for each
> doubling of the bit rate. At 16 kbps, my files range
from 1-3 MB, so for 32
> kbps (which I'm leaning toward now), they are 2-6 MB. My
questions are
>
> What's the concensus on the best bit rate for Internet
sound files, especially
> voice?
The best is the import high quality sound in wav format. Than
in library you can
play around with m3p compression changing the rates and all.
Checking the quality
versus the file size and find one that suit your needs. There
is no BEST format to
import. Every single fill have individual setting. It's all
depends on the sound.
Like, in case of voice. Very different to other sounds.
Save it as ADPCM (adaptive pulse code modulation) or Mp3
9kbps as your second choice.
Also take note that STREAM always lower down the quality , it
suppose to load fast so flash reduce
it enormously , usually sound like pure crap, go to library
(CTRL L to open) right click your sound
and go to properties, adjust the compression and type of
audio format to find best size and quality...
> How important is it to minimize files size? The files
are already large enough
> so that dial-up folks will probably not listen to them,
and even the larger
> files seem to download fast enough with my cable
connection.
You would be surprised. I was doing voice overs two or 3
weeks ago for a client.
Needed 5 sounds , up to two minutes each, for different
slides. Ranging from 2.5 MB
to 2.9 MB per file.
After compressing all of them, I had 5 sounds in very good
quality of total size 1.4 MB
Best Regards
Urami
<urami>
If you want to mail me - DO NOT LAUGH AT MY ADDRESS
</urami>

QT file size off the chart

i am exporting a basketball game that i have off a camera. the file is 13 gb already. i want it way smaller but still good quality to watch as a quicktime. when i export as 422 it bloats to 44 gb. if i use h264 it is small - under 1 gb, but very ugly. i have exported tons of video before and usually using 422 makes things smaller - not larger.
DV, 720 × 480 (640 × 480), Millions
16-bit Integer (Big Endian), Stereo, 48.000 kHz
this is the native file info? any help?

i am exporting a basketball game that i have off a camera. the file is 13 gb already.
The file size is directly proportional to the total audio + video data rate.
i want it way smaller but still good quality to watch as a quicktime.
A "quicktime" movie is any QT or third-party data compression format in an MOV file container that is play on a system having properly configured QT component support. There a dozens of possibilities which can be combined in hundreds of possible ways with settings offering thousands of possibilities. Can you be more specific regarding your goals?
if i use h264 it is small - under 1 gb, but very ugly.
H.264 is a very efficient codec with a wide range of useable video data rates. Depending on your requirements for display dimensions, minimum quality acceptability, and/or maximum acceptable file size, there should be a data rate the will server your needs. Basically, SD H.264 video can be exported in the range of 1 to 18 Mbps depending on what your will settle for in terms of quality and file size for a particular display size. Quality is proportional to the data rate which is inversely proportional to the file size. What you need to to is find a happy medium between these three requirements.
DV, 720 × 480 (640 × 480), Millions, 16-bit Integer (Big Endian), Stereo, 48.000 kHz... this is the native file info? any help?
This looks like a video editor capture of camcorder content in standard definition. It likely has a total video data rate on the order of 28.5 Mbps (about 13 GBs per hour of content). Since your previous H.264 export indicates a combined total data rate on the order of 2.2 Mbps, you might try manually exporting the file limiting the video data rate to something in the 3 to 4 Mbps range and an AAC stereo audio track of 160 Kbps @ 48.0 KHz. This should improve quality and provide a target file one quarter to one third the size of your original "source" file. Since you did not provide any information regarding the aspect ratio, I cannot provide specific dimensions settings here. (I.e. if source was PAR 16:9, then you might target a 853x480 display size or 640x480 if in a 4:3 for smaller file size or 720x480 PAR encode for 640x480 playback if you want to force the video data to encode at a higher data rate. (I.e., H.264 video is adaptive depending on the content and settings used.)
I think it is a file that was captured at a high def type setting - although it was not high def to begin with. thus the huge file.
The original file on the camcorder may have been HD, but the captured file is SD and the file size of 13 GB is quite normal for an hour of content using the DV-25 codec. (DV-50 and DV-100 files would be double and quadruple this size.) This is simply a low efficiency (i.e., low compression format) which provides higher editing quality at the expense of file size.

Quicktime doubles file size - Why?

In Quicktime Pro I open up a dv video file that is one hour, 12 GB. I select Save As and it tells me that to save the file as an .mov will take 24 GB.
Q1: Why is this the case?
Q2: My properties window lists a video track, a sound track, and a track that appears to be the original DV file. Why the redundancy?
Q3: Can I reduce the file size without exporting or using the Save as Reference Movie option?

As a test, I chose SAVE AS on the original 25gb videot, the SAVE AS window told me that the new SAVE AS file would be 50gb!! I'm new to all this, so I have no idea what I'm doing wrong!
To some extent it is a numbers game. In an MOV file the DV audio and DV video are counted separately and added together in both the "Inspector" window and the Finder "Info" window. In the DV file container the "Inspector" window still doubles the file size but the Finder "Info" window only counts a single DV stream. If it Bothers you, either do your trimming in MPEG Streamclip (free) or, if you've already saved some files in MOV containers, then open them in MPEG Streamclip and use the "Save As..." option to re-save them but select the "DV" file container this time. When done, compare the DV file with the MOV file using the Finder "Info" window.

I print 2 pages to pdf and file size is 600k, I print 1 additonal page and file size goes to 6M, what would cause this (graphics are same on all pages)

I print 2 pages to pdf and file size is 600k, I print 1 additonal page and file size goes to 6M, what would cause this (graphics are same on all pages).
I know the colour graphic shading in the document that causes the issue of larger file size, but it doesn't make sense that printing 1 additional page with same information as first 2 pages would cause this.

I print 2 pages to pdf and file size is 600k, I print 1 additonal page and file size goes to 6M, what would cause this (graphics are same on all pages).
I know the colour graphic shading in the document that causes the issue of larger file size, but it doesn't make sense that printing 1 additional page with same information as first 2 pages would cause this.

Reader Error: There was an error opening this document. The file size exceeds the limit allowed...

The full error is: There was an error opening this document. The file size exceeds the limit allowed and cannot be saved.
I didn't think Reader had a size limit? The file is only a couple of hundred MB.
Does anyone have an idea what could be causing this error?
-Richard.

Is that an online document, or a local one?
If online, see http://answers.microsoft.com/en-us/windows/forum/windows_xp-hardware/error-0x800700df-the- file-size-exceeds-the-limit/d208bba6-920c-4639-bd45-f345f462934f

Embedding Chinese Characters and File Size

Hello,
Recently my company commissioned a Flash based eLearning module from a vendor. The module was in English. We then contracted a version in Chinese. When we got the files back we noticed a dramatic increase in the file size of the relevant resources. The size increase is substantial and causing problems with deployment.
I suspect this may have something to do with font embedding, but don't know for sure. My question: is it conceivable that embedding Chinese fonts would cause a dramatic increase in file size?
I'm including screenshots of the resource files for both the English and Chinese versions.
Thanks

no.
i wouldn't think the fonts would increase the file by more than 200k and i don't think there's any significant difference in swf file size published by the various versions of flash.

What is the file size of the OS X Mavericks 10.9.4 update?

What is the file size of the OS X Mavericks 10.9.4 update? I have a limited 4G connection, so this information would be useful BEFORE downloading, as it could put me over my limit and incur additional cost.

The Delta version is 283 MB: OS X Mavericks 10.9.4 Update
The Combo is 958 MB: OS X Mavericks 10.9.4 Update (Combo)

Image dimensions and file size, why the change?

Similar Messages

Maybe you are looking for