JPEG Sizes

I am having issues with saving Photoshop projects that contain RAW files + additional layers to JPEG's that are 17mb or higher. My settings are the same across the board for saves: save, JPEG, Standard (Baseline) 12 - Maximum.
I have one file that I edited in Lightroom and manipulated further in Photoshop. I added a layer along with a curve. Saved it as a JPEG and had a file size of 20mb, approx. I needed to make changes to the original RAW file. I went back to Lightroom, made my changes, re-imported the new file into Photoshop and performed the same functions as the last file and even added a Vibrance layer. I saved the file and was giving a file size of 10mb. I need to have files saved as JPEG with a minimum of 17mb. What am I doing wrong?
I checked with Adobe Help Desk and was told that Photoshop decides on the file size as it sees fit. I need to find a simple solution to skirt this issue and save files in JPEG form in higher mb.
Thank you for any help.

Robert, You might want to look a bit closer at the Alamy.com website.
They are asking for uncompressed file sizes of more than 17 MB.
In fact if you hover your cursor over this requirement on their website, a tip pops up that says:
"When you open a JPEG in picture editing software (i.e. Photoshop). it is uncompressed."
So they aren't asking for a file size >17MB in the Mac Finder or Windows Explorer, but rather its uncompressed size in Photoshop.
For example, the image below is only 6 MB in the Mac Finder, but uncompressed in Photoshop is it over 190MB.
At the bottom of your image frame in PS there is a field that can display various parameters of your image by clicking on the arrow to the right.
Click this arrow and select File Size.
I'm sure your file size is adequate for them.
However, I would pay attention to the list of "We reject images for . . . requirements.

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<...>. Only minor thing i have noticed is the
jpeg size is only2.8ish meg when exported from
aperture, as apposed to a file that was exported
using Nikon picture project or Capture NX and
retouched to Black and White in Photoshop which ends
up at around 3.8-4.5meg as a jpeg.
Does anyone know why, and is it something to be
concerned about?
The JPEG size is a function of JPEG quality - it could be that NX is set to output lossles JPG, or at least a higher quality level.
For any export preset, you can edit it and adjust the JPG quality - if you highlight an export preset while in the preset editing mode, and hit the "+" button at the bottom left, if will duplicate that preset so you can make a slightly different one.
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It is a very excellent app to mange my photos.
Recently I need some photos from iPhoto for the use in my web project.
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If the pref file was damaged your test library would have exhibited problems also. Try the following:
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Thanks very much. Yes, command-i is helpful when you just need to know the size of the file.
Here's what I use it for: I need to make all images under 250KB to post to a particular website. I do this all the time, but all the images start off in different quality, resolution and size because they're all from different sources. I don't want to change proportions, image size, or resolution -- just the file size (quality slider).
So I used to click through them all, one by one, in Preview, and "save-as." I slide the quality slider down for each successive image until the file size is just under 250KB, then I save it.
Without this feature, I have to do a trial-and-error for each image, then "command-i" each one. Some end up over 250KB, some too far under. So I try again on perhaps 90% of them, trying to remember which were too big and which were too small, and over and over again, getting just a few right with each pass, until all images are about the correct size.
Something that used to take 5 minutes (for, say, 50 images) now takes -- no joke -- two hours.
It doesn't seem possible that Apple really eliminated this feature -- and for what reason?
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OT

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TRIAL 1
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Hi,
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Hi, can someone explain the following.
I've just exported some photos for printing in Lightroom and set the size to 100% and the JPEG quality to 100%. On one photo the export size is 10.1Mb when I then open file and resave it, still keeping the image size the same & re-saving at 100% JPEG quality the filesize drops to about 4Mb.
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Do you Twango?
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