photos

Hello j'ai des photos de pieces  sur un fond noir 

ce que je veux faire 

je veux que le fond soit blanc 

pour le catalo0g

est possible de faire ce changement de noir a blanc

merci

Post them in this thread https://fr.numista.com/forum/topic49686.html (the easiest route) or remove it yourself with image editing software like Photoshop, Gimp, Photoscape etc. or some only tool for background erasure (just search ‘remove background online’). The simpler the shape and higher the contrast between object and background the easier it is.
 

Photoshop is often way more convenient and easier but you obviously have to own it too. 

Gimp can do mostly the same things but is way more irritating to us. 

PhotoScape and similar programs have free versions but are way more limited in what they can do but most things they can do are good enough. Some old crudely made examples in PhotoScape X for round (the easiest), irregular and one with a more complex shape:

The Internet option would be the fastest but you have to be okay with uploading your pictures to an external site. But depending on the case they can be either hit or miss and you can not influence the outcome that much.