you can create the files in png.
save that file in case you want to modify it. SAVE AS .jpg to display the file
i use free software on my Win10/11 PCs GIMP & Paint.net which use layers (.xcf & .pdn formats respectively), Photoshop & CorelDraw (paid apps) also use layers. Layers permit to have overlay the previous layer with a new one. the last layer covers the previous one, which is why you should only add images which support transparency:

Comparing Different Transparent Image file Types

to recapitulate - to create an IMAGE FILE of superimposed images, use software that supports LAYERS and use images the support TRANSPARENCY!

Thanks, I really want to do it with my own software. It seems I have to use PNG images. Right?

use .png, then, if possible save file.png, then save as file.jpg

if possible save file.png, then save as file.jpg

 

it doesn't work like that, he needs to encode it to png and then encode it again to jpg. you don't just save an image with a simple file stream just by changing the extension, it must be encoded it its own format. but yet again, he'll still lose the transparency effect though since jpeg is RGB (24-bit) and png is ARGB (32-bit), which means it doesn't have the alpha channel to support transparency. so the transparency will turn into black background instead, so it doesn't really matter.

 

Should I use PNG files instead?

Is there a way to still use jpg files? 

 

you don't have a choice, but why do you insist on jpg though? is it because of Delphi's limit of component support?

 

Well, there aré some good support for jpg files and in fact, I have too many jpg imagen to work with. 

I have too many jpg imagen to work with. 

 

will it be a problem to convert them all to png? i mean, CloudConvert could mass convert them in batch;

I would go with png. Png is wide supported and used format. Why do you need transparency at all?

You work inside of app with TBitmap which uses transparency. Final result can be jpeg with background of your need (user can peek up).

Why do you need transparency at all?

 

i believe it is because he wants the letters and symbols to stand out, and not be distracted by an RGB background, which makes sense because it will be easier to make the foreground become clear to the user's sight.

Sinisa, thanks for your feedback. Can you give me an example code of two jpg images with transparency in the background?

thanks a lot…