Need advice for controlling MB size when reducing image size.

I'm downsizing a large batch of images that all need to end up as 1.5 to 2 MB jpegs. All of the images from my camera start at the same MB size in the RAW files, When I export/resize them they come out in varied sizes, in this case from 1.4 MB to 3.8 MB. I seem to have come across something that seems very simple that is kicking my butt. Are any of you aware of a way to control the image file size instead of pixel dimension when downsizing?

Please provide the LR version (i.e. 3.6, 4.1,??) you are using and ALL of the Export settings used for both the single and multiple file (i.e. "batch) Export. Did you use the exact same settings for both, and did you do anything differently for the sinlge file versus multiple file export? There should be absolutely no difference between the two, unless you changed some settings, or inadvertently used different files. For example, if you shoot raw + JPEG you may have accidently used the JPEG instead of raw for one of the Exports. This may give you slightly different Export file sizes.
stockphotog.miller wrote:
trshaner, I have no idea why the files have to be that size, that's just the requirements of the customer. I'm trying to convert from RAW to jpeg.
You need to talk to your customer about this requirement. As dj_page and I have already told you this makes no sense! I think your customer is confusing "open file size" (i.e. camera megapixels) with "actual file size." Using a Canon 5D MKII raw image:
Camera Megapixels (Mp) = 5,616 x 3,744 = 21.03 Megapixels = 21.03 (Mp) x 3 (RGB) x x 2 (16 bit data) = 120 MB (126,189,568 bytes)
1 Megabyte= 1,048,576 bytes
LR Export File Size
TIFF, ProPhoto RGB, No Compression, 16 bit depth = 120.0 MB
TIFF, ProPhoto RGB, ZIP Compression, 16 bit depth = 101.9 MB (lossless compression)
JPEG, sRGB, 100 Quality = 13.9 MB (JPEGs are 8 bit depth lossy compression)
JPEG, sRGB, 90 Quality = 7.6 MB (JPEGs are 8 bit depth lossy compression)
JPEG, sRGB, 80 Quality = 4.8 MB (JPEGs are 8 bit depth lossy compression)
ALL of the above image files contain the exact same number of Camera Megapixels (i.e. have the same resolution)!
Message was edited by: trshaner
Corrected TIFF no compression file size.

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