Converting raw images into .jpgs.

I took some pictures with my Canon 5D, using the camera's raw format. They turned out to be about 14MB. However, when I converted them to .jpgs, using Photoshop CC, they were only about 4MB. I needed to have .jpgs about 10 MB. How do I do that? I made them the highest quality, etc. I still could only get about 4MB in size. Do I have to lose all that data just by converting them to .jpg? Thank you for any help!

file size in MB is a very poor criterion for judging image quality because reduction in file size is very dependent upon the original image content.
Compare a complex multicolored photo converted to .jpg with an image (same original size) filled with pure white or gray or black; then compare the .jpg sizes.
As indicated above, use .tif or other uncompressed (lossless) file format to retain image quality....use .png if image needs to keep transparency.
Consider using camera settings to produce both raw and .jpg images from same shot (too late for images already shot) and compare/use whichever suits your needs best. 
There are many (many free) progs to convert various raw formats to .jpg; some better than others, all results will be at least slightly different.

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