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... Working with PDF documents in Java, developers often encounter the choice between open-source libraries like Apache PDFBox and commercial solutions like JPedal. While PDFBox... 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... 
