Something odd is happening with UO Fiddler.

I am trying to add custom art to the High Seas client. This is the classic client (as far as I can tell). I use the "replace" function to add art to an empty slot. Then I save the fie, in this case the gumpart file, and copy that to the HS folder. I then delete the gupart UOP file and use Fiddler to convert the MUL files to the gump UOP file. Now when I launch UO the paperdoll gump art is corrupted.

Here are the images from start to finish:
The original artwork:


Now here is how it looks in UO Fiddler when I've added it to the gump art:


Here is how it looks in Ultima:


At this point I am wondering if there's something corrupted in my client files. So I exported the art back out from Fiddler and this is what I get:

Keep in mind that in Fiddler this item looks fine but when it is exported I get the corrupted image.
I am having similar problems with the tile art as well.
Has anyone else had this problem?

Thanks for any help you can offer

Remove the "truwhite" color from the pic if you are using .bmp format iirc you need to convert it from 0 0 0 to 3 3 3 for it to not show trasnparency but I think Turley can give you a more specific answer on that.

But the problem occurs when Fiddler is using "truewhite and trueblack" colors as transparency when handling .bmps

I assume I'd use an image editor for this Tomi?

I figured out how to do what you suggested. Thanks Tomi. You saved the day again.

Here's what I did to correct the issue. My original artwork was in the form of BMP files. So I used MS paint to save the files as TIFF files. One issue with MS Paint is it saves the TIFF files as *.tif and Fiddler wants the second "t" (tiff) in the extension otherwise it won't see the file when you try to import it. Time to find a different paint program.

You just save it as .tif and rename the extension to .tiff
Same files different naming of extensions

Right. There's a bit more I had to do for some of the files. For example some of the imported TIFF files had a rectangular border around them. With those I had to load in the BMP file to paint, sample the transparent "colour", and then load in the TIFF and bucket fill the area that is supposed to be transparent.

I swear I am not going through this again! If a new client is released that I can't use the old art files with I'm doing an item wipe to get rid of our custom art and we'll just live with it.

Utilities like UO Fiddler are terrific but they're quirky and adding art isn't an easy one or two step process. I suppose it could be if the utility is written with that in mind but Fiddler wasn't. Don't get me wrong. I appreciate all the work that went into it. I am grateful that Turley created the program. Without Fiddler we'd be out of luck with adding anything to the latest client. However, I wish there was an easier way to add wearables.

Anyway, thanks for all the help and especially thanks to Turley.