Sounds like you need to convert the image to a PNG file and delete the white from it to get the transparency you are looking for. A JPG file substitues a transparent part to white when using an image editor such as photoshop when saving to a jpg. You can not get a tranparent background using a jpg file.
While what you are doing should work if you follow Marc's advice about using PNG, be aware of this known bug if you try to insert that file into a container field:
For More Information see: http://forums.filemaker.com/posts/041cdb204b?page=2
This is one of many acknowledged bugs that can be found in the Known Bug List thread here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: https://www.dropbox.com/s/jt09b82i0xijbu3/FMP%20Bugs.zip
As I stated, the JPG has worked up until FP12 so I differ in opinion with any substitutions you claim are made by JPG saves. However I will try saving the image as a PNG. And in every other situation I have applied the invisible background JPG the results are as expected.
Thanks for your opinion.
I have not used container fields before and will try to avoid their use now, especially if it is known that there are possible unpredictable results.
I have a lot more experience in the graphics department than I do in the database department, and I assure you, you cannot have a .jpg image with a transparent background. I'm not sure how you achieved this in FP9 but a jpg has no such thing as a transparent background it is what is called an alpha channel. JPG do not support an alph channel, it converts to white. When you converted your file over from FP9 to FP12 it may have converted the image from one type to another, I am not sure.
Also simply saving the image as a PNG file will not work for what you need, you will need an image editor now to edit out the white, and convert it to transparent. If you post the image, I would be more than happy to edit it for you if you do not have an editor.
No need to avoid using them--just follow the information in the thread that I posted if you want to get a PNG file into a container field that preserves transparency.
Thanks for the generous offer. The JPGs with transparent background were manipulated in Photoshop and saved as both JPG and PSD. I guess we have to agree to disagree since I have, depending on the program involved, either dropped the file in or done a copy and paste from the JPG file. It does seem impossible based on the fact that there is no way for a JPG to carry the info, but results don't lie.
Since my image is a signature its not something I'd want to transfer thru the forum. Any idea if I decide to take you up on your offer. While I can/have removed the background to create the files I have, I have to admit I'm fuzzy on the details.
Okay. I will keep that as an option since it will preserve transparency.
I'll inbox you my personal email address.