transparent-background image; image with transparency
Computing term for a digital image whose background is transparent, commonly used in graphic design and web development.
Using a transparent-background image for a website logo helps it blend into the background.
transmission image; X-ray image
Refers to an image produced by passing radiation through an object, such as an X-ray or other radiographic image.
The doctor explained the fracture condition while looking at the transmission image.
透過 means 'transmission' or 'penetration' and is the base concept; 透過画像 is a compound noun for a specific type of image.
画像 is a general term for 'image' or 'picture'; 透過画像 specifies an image with transparency or a transmission-based image.
Compound of 透過 (transmission, penetration) and 画像 (image). The computing sense is a modern extension of the literal meaning.