Custom Post Image Sizes Future

I’ve tried to get help from main “how to topic”, but no one seems to now the solution. Maybe more expirienced programmers can help?

The problem is wordpress creating to many images if adding new image size with function “add_image_size”.

F.e. if I add 5 new image sizes wordpress will create 8 same images (5 new + 3 standart) for all uploaded images. But what if I just nedd 1 or 2 new images for my custom type post?

I don’t want to have huge number of unnecessary files and occupy too much space on my hosting.

I just need for examle, for post type “products” it creates one set of image sizes, for post type “gallery” another set of img sizes.

I’m struggling almost 2 days with this problem.

If you now the solution, pls post it here.

I’m sure it will be very usefull for all wordpress users!