I’d like to make scrollable image gallery box, not GUI but using GameObjects.
Scroll is ok. I could do in some way but
I don’t know how to render only part of gallery images, which are only in specific bounds.(like gallery pop-up).

I found some answers related articles with Unity GUI but not for SpriteRenderers
Can anybody give me a clue??

Use Sprite Masks : Unity - Manual: Sprite Masks