Sure they all "do it", you just may not know enough about each program to actually be able to pull it off. Or straight to the point: Your workflow is most likely wrong. The actual GIF will have to be created in PS, but otherwise you are free to e.g. produce a keyed sequence rendered to a transparent format in either PR or AE.
First of all, many apologies for the tardy spelling and grammar of my original question. The text escaped before completion!
Many thanks for your comment, Mylenium. Your ..."you may not know..." and "...your workflow is most likely wrong...." are precisely why I posted the question. I was asking for guidance. As it happens, I have extensive experience with Premiere Pro, I have been with it since 5.0 and many programmes have been successfully completed, with very satisfied producers. It was just this particular requirement that I couldn't make work. My associate is the PhotoShop and After Effects expert and even he couldn't see it.
We are still trying to "do it" in all of the available CC software and we wanted a little help. Thanks anyway.
Hi Alan, yes you should be able to key the blue out as long as there is no blue in the Foreground Element u want to be visible. Just do following:
1. Go to Effect ---> Keying ----> Keylight... then select the blue color and adjust the settings. Google or Youtube search "Advanced After effects Keying Tutorial" if you need extra help.
2. Now that u have ur Element with Alpha channel, i think you will have to do the following to open it in Photoshop to turn it into an animated GIF.
a) File ----> Export----> Add to Render Queu
b) Click on Orange "Lossless" text:
c) Select "Quicktime" for FORMAT
d) Click Format Options...Codec = ANIMATION
e) Make sure Channels is set to: RGB+ Alpha (Very Important for Transparent Backgrounds/Alpha channel) ...Click OK, then Render it
3. Then Open that Movie with Alpha channel into Photoshop using i think: File ---> Import Video Frames
Then click File ---> Export ---> Save for Web(Legacy) and choose Gif, choose the one that has alpha channel with the grey and white squares.
Hope that helps at all Alan.
Thanks you very much for the new information. Just at present, I am away from home and although possible, I do not have the CC programmes on my laptop! It will run, with some careful management of disc space but it does get a bit tetchy when you are editing AVHD files in PrPro CC2015. As soon as I am home, I shall run through your suggestions and hopefully have some happy results. Very many thanks.