You think you have found a bug ? You've got a suggestion to modify PhotoFiltre ? /
Ĉu vi opinias vi trovis malbonadĵon ? Ĉu vi havas sugeston por modifi PhotoFiltre ?
I think you are working with the freeware 6.2.7 release.
The transparency in this release can only be managed in Indexed colours mode, as last part of your work (before saving).
That's to say only in 256 colours.
When you want to save a picture for a later use with transparency, you can prepare the picture with a single colour area,
which will be turn in transparency, in a proper time, and you save it in jpeg or png type.
When needed, the picture can be re-opened, and the area of single colour can be selected with the magic wand.
Any other picture can be pasted in, or you can inverse selection and copy the selected part of the picture, to paste it on an other picture.
The single colour area is then full transparent, and before validate pasting, a right clic in the selection, enables to adjust opacity of your pasted picture.