Trimming white from jpeg logos

[bwood]

Seems to happen every late summer. I have a banner that I’m constructing for a United Appeal type of Facebook page.
I’ve requested about 17 logos from different sources. Also I requested png logos. I ended up with a bunch of jpgs.

The jpg logos have clearly defined shapes. Some are round, or square etc, and all with the customary white background.
I’d like to take the white (No color) away from the background only. Some are a little more complicated with actual white in the logo.

Perhaps someone could point me in the right direction and I’ll figure it out for myself, because I was too dumb to save my notes from last time. The logos are pretty uncomplicated. I’ve included a screenshot of some of the logos I have to clean up. Apologies for the awful screenshot. It’ll give you an idea. Thanks all ~Bill
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