Batch Saving To .png W/o Losing Canvas Pixel Dimension

Hi everyone, I introduced myself in a former thread. Name is Katie. I'm not new to Photoshop but am new to the more murky world of saving formats for various uses, printing, etc. I am in grad school, we're between semesters, and of all things they haven't really talked about saving! This week I was freelancing and saving to .JPG and .PNG, multiple images.

Problem:
I edited 150 images of product for a retail website on photoshopCS6. Company requires three sizes: two in .jpg, one in .png. Each image was in its own layer, in a group folder; a drop shadow effect was applied to the whole folder. For ea size requirement, I changed the canvas, resized all images at once to fit within it and ran the script.

I was able to run the Script on PS to batch save the .jpgs, and they RETAINED their canvas pixel dimensions in each image (700x525; 170x170). When I ran the same script to PNG-24, it worked but it DID NOT retain the canvas size and they were all wildly different.

I did some research, and found that people had to install script fixes to do this. I installed Dr. Russell's script for Image Processor Pro that should work in PS and Bridge. I tried it, still didn't work to retain size of PNGs. Am I simply using it wrong? Is that the only way to batch save certain file formats?

Because the images were due this morning, I individually saved every png ("save as" not "web/Devices") to ensure they were all 300x350.

I need to know there's a better way to do this for all other file formats, so I don't have to painstakingly save each image.


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