An Image is a numeric representation (normally it is binary) of a two-dimensional image. Depending on whether the image resolution is fixed (non changeable), it may be of vector or raster type. Without qualifications, the term “image” usually refers to raster images also called bitmap images.
Image
Why convert PDF files to GIF images? A PDF is a vector image (so it is rendered when you display it at whatever size... Why convert PDF files to JPEG images? A PDF is a vector image (so it is rendered when you display it at whatever size... Apache PDFBox and JPedal both date back to the early 2000s. For most of that time the two projects ran in parallel: different teams,... TL;DR: Java’s ImageIO has partial TIFF support, but it regressed between Java 8 and Java 11 and images that wrote correctly in Java 8... TL;DR: Java’s ImageIO has no HEIC support. To write HEIC files in Java you need an external library. JDeli is the only pure Java... 
