CS5 - Photo Saving and File Size

Recently I've noticed, when uploading some photo's to my web site that the file size is rather small. I know that cropping, processing, and saving to jpeg results in file size reduction.
So ... I did a test. I took one photo shot in the raw format (the file size was about 21 mp). I then took it into Photoshop CS5 and just saved it as a jpeg ... and the file size went to 9.9 mp. I found that to be a questionable reduction.
My image size details of the test photo is:
Pixel Dimenstions:
5616 px x 3744 px
Document Size:
18.72 x 12.48 and 300 px Resolution
All of the following are checked:
Scale Style
Constrain Proportions
Resize Image
I have selected:
Bicubic (best for smooth gradients)
I saved the photo at the highest quality setting of 12
So the Question: Is this test reduction normal or am I doing something wrong with my "save as" settings

There is no set percentage of compression, it depends on the image content. If there are layers jpeg will not save so that in itself will reduce size. Some web options even strip out metadata. So are you thinking that is too much or too little compression?
I do know that there can be significant differences in saving at image quality 9 or 10 and at 12. Try it and see what you get. For what is the correct compression it depends on the end use. For web use maybe all you need is 5.

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Confused with saving and file sizes

HI THERE. IM JUST A LITTLE CONFUSED ON HOW TO SEND MY FILES. I WANT A POSTER PRINTED THAT IS 196cm height // 143cm width. WHICH IS THE SIZE OF THE DOCUMENT I MADE ON PHOTOSHOP. HOWEVER IM CONFUSED ON SAVING THIS FILE AS ITS TOO LARGE APPARANTLY AND CANNOT BE SENT BY EMAIL. IVE FLATTENED THE IMAGE AND SAVED AS A JPEG BUT ITS STILL A HUGE FILE. COULD YOU TELL ME WHERE IM GOING WRONG?? IM SO CONFUSED.

Most likely you increased the pixel count too high which inflated the file size required. An image that large is not viewed up close so you do not need to print it at a high resilution like 300Dpi. Pring an image that size at 100Dpi will be fine.
196cm x 143cm at 300dpi is 23150px by 16890px = 391,003,500px 391Mpixels
196cm x 143cm at 200dpi is 15433px by 11260px = 173,775,580px 174Mpixels
196cm x 143cm at 100dpi is 7717px by 5630px = 43,446,710px 43Mpixels
Your camera pixels are most likely nearer to 43Mpixels then to 391Mpixel intepolation can do just so much adding that many pixels will only produce a soft image anyway IMO

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?

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.

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

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.

I Photo Book Design and File Sizes??

I Photo ? for any photo buffs out there-- I cant find what the largest file size i can import for an iphoto book-
Also--i am making my own photo page using another program and then I guess i will then import them to iPhoto so i can import them to a book-
also-- when it says ful page bleed-- it appears that iphoto still puts a grey border around--thus making your photo page smaller-- any work arounds this??
I want all my pages to have photo end to end-- complete bleed to the page edges -Thanks for any --All Help!! T Hopkins
I have Lion operating system-- do not see it as a choice to select here either?

From what I've observed in my books full bleed was just that. Have you checked out a sample book at your nearest Apple store?
The page dimensions are 8.5 x 11 for the standard, hard cover book. Photos should have the sRGB color profile (NOT the Adobe RGB profile). Since iPhoto creates a pdf of the book at 300 dpi for uploading and printing photos don't need to have a dpi resolution any higher than that.
An easy way to get the page from a 3rd party app into iPhoto would be to do a Print ➙ PDF ➙ Save PDF to iPhoto. This will create a jpg file of the page and import it into iPhoto. If you don't have the Save PDF to iPhoto option in the PDF menu you can download the file, a 300 dpi version, Save PDF to iPhoto 300 DPI.workflow from Toad's Cellar and place it in the HD/Library/PDF Services folder.
OT

Specify exact pixel and file size

Hello,
I have recently purchased Photoshop Elements 4.0 for Windows for a company project. I need to compile a number of outdoor photographs to be uploaded to a specific website. The photo specifications required by the website are that all photos must in JPG format, be 350 pixels across and no more than 40kbs in file size. I've been experimenting with photoshop to try and achieve this effect, but am wondering if there is a simple way to accomplish this. I have been able to adjust horizontal pixel number, which automatically adjusts vertical pixel number and photo size. When I save photos, I am able to adjust what I assume is the resolution of the photo. If there is not too much color contrast in the photo, I can sometimes reduce the file size to 40kbs by taking it as low as it will go, but not always. I was just wondering if there is a simple way to make sure that a photo will be saved with a specific pixel number and no more than a certain file size (40kbs). I would greatly appreciate any suggestions.
Brandon

You can also set the pixel dimensions in S4W and save a step. Just enter the size you want in the box about halfway down the right panel, and then click Apply. Then you can optimize the file size by clicking the right-facing arrow at the upper right of the panel and choosing Optimize to file size. You can specify the exact size you want. Just watch the preview to be sure the quality is good enough at the target size.

Maximum Number of Pages and File Size for PDFs

Assuming that your computer has ample CPU, memory,and storage, how many pages and what file size does Adobe recommend that you limit a single PDF to using Acrobat Pro XI in order to avoid any issues.

I don't know whether there's a limit on number of pictures you can add to a book
as long as they are contained in 100 pages, which is the maximum photo pages on a book.

Lightroom 4 - presets and file sizes

When i apply a preset to a photo, then export it ... the file i end up with is significanatly smaller than my original file ? These same presets resulted in as large / or in most cases larger files sizes in previous versions of lightroom ...

Develop Module Presets have almost nothing to do with file size.
File Size is a function of Pixel Dimensions, File Format and Compression (if any)
I suspect you are exporting them with different settings than you were in previous versions of Lightroom.
What is the file format to which you are exporting? What are the settings for File Type, Quality, Compressoin? What are your Dimensions? How do these settings in Export differ from your previous exporting?

Saved VI file size changes when data is visible on a graph but not the default value

If a VI is saved when data is visible on a graph, the file size is larger; even though the default is set to be a blank graph. I have tested this in LabVIEW 8.6 and 2009. If you load the larger file, the graph is blank as expected. If this behavior is by design, it appears odd to me.
To duplicate the issue:
Create a blank VI.
Add a Sine Waveform VI and set the number of samples to 1,000,000.
Add a Waveform Graph VI that spans the entire monitor and connect it to the output of the Sine Waveform VI.
Save the VI and note the file size.
Run the VI.
Save the VI and compare the size to the original size.
The VI file size is larger.
In the Waveform Graph, select “Reinitialize to default value.
The VI file size returns to It’s original size.

Your obeservation is correct, and expected behavior.
This behavior is useful when you have inputs that you would like to set as defaults for the user.
Obviously, if there is a value to be saved, it will require some memory to store the value.
If the input is left empty by default, that memory is made available again.
It may not be easy to think of a good use for this for a graph, but think about for numeric or string controls.
What if the user isnt sure how they should input a certain parameter or value?
You could store a default value so they could see how they should input their value.
Message Edited by Cory K on 09-15-2009 11:12 AM
Cory K

Digital Image and File Size

Other than using an Image editing App such as iPhoto or Photoshop Elements, is there a way to figure out or calculate the file size (in MB) of an image containing xx number of pixels? Thanks, Bob

Robert:
To add to Barbara's post, you can set the pixel dimensions and dpi to what you need in PS/PSE and then do a Save As where you'll get a slider to set the quality level and it will tell you what file size that will result in.
However, as Terence pointed out, some trial and error in exporting out of iPhoto and setting the dimensions to what you want and selecting a different quality level will quickly tell you what you need to achieve those specs.
TIP: For insurance against the iPhoto database corruption that many users have experienced I recommend making a backup copy of the Library6.iPhoto database file and keep it current. If problems crop up where iPhoto suddenly can't see any photos or thinks there are no photos in the library, replacing the working Library6.iPhoto file with the backup will often get the library back. By keeping it current I mean backup after each import and/or any serious editing or work on books, slideshows, calendars, cards, etc. That insures that if a problem pops up and you do need to replace the database file, you'll retain all those efforts. It doesn't take long to make the backup and it's good insurance.
I've created an Automator workflow application (requires Tiger), iPhoto dB File Backup, that will copy the selected Library6.iPhoto file from your iPhoto Library folder to the Pictures folder, replacing any previous version of it. It's compatible with iPhoto 08 libraries and Leopard. iPhoto does not have to be closed to run the application, just idle. You can download it at Toad's Cellar. Be sure to read the Read Me pdf file.

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

IMovie music rights and file size questions

1. I'm producing a movie of videos and still photos from a recent vacation strictly for personal family use, not commercial. Is there any violation at all of copyrights if I add songs or loops from a commercial artists music CD? Also, I'm assuming no rights problem with using in my home movie the Garage Band loops that came with my iLife'06.
2. I'm wondering about the file size of my movie so far. It is 26 minutes long and 6.5 GB! I'm guessing I'll end up with about 40 minutes. What is the compression procedure so I can later record the movie to a typical 4.9 GB DVD disc? BTW I'm using an external LaCie burner to get around problems with the 2X DVD burner in my 2002 G4 Quicksilver.
Many thanks in advance.
Raymon

The "personal use" issue (in the U.S. anyway) was resolved in the users favor when the first VHS recorders started shipping.
There are also millions of files that are "royalty free" that be used in any fashion.
Don't worry about the file size of your iMovie project. iDVD only uses the "time" (up to 2 hours) and will handle the compression automatically.

Export Options_Automatic Stacking and File Size control

There is a big hang-up in work flow, and I'd assume it's the same for many professional photographers.
It would be great to be able to Export an edited photo (tiff, psd, jpg, RAW), and during the export be able to specify maximum file size (as you can control in Photoshop's Save to Web command), and then also be able to have Lighroom automatically stack the exported image with the original.
This is a big hang-up when you're finished editing multiple sized copies due to different media, and then you have the final web-sized image for your photo gallery. CUrrently, I have to go to Save to Web in Photoshop, and then save it to my desktop. Then I have to manually import that compressed jpg into Lightroom, and put it into the original library or collection.

Yes, the ability to export to a given file size would be awesome for those of us who post many images to the web.
Also, being able to export and automatically add the exported file to my catalogue (Same as when you edit in PS) stacked with the original, would really aid my workflow.

CS5 - Photo Saving and File Size

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