heic to jpg

01 How to open a RAW, PSD or HEIC file you were sent A Mac opens all three with nothing installed. Windows needs extensions, one of them paid, and Linux one package. The commands, what each one gets wrong, and a viewer for any device. Guide 02 How to check an image is sharp enough to print Is this photo or logo good enough for a flyer, a poster or a business card? Ignore the DPI number in the file: divide the pixels by the printed size. The arithmetic, a table of pixels per paper size, and the commands that check a file or a finished PDF. Guide 03 How to convert between image formats Which image format to pick and why (JPEG, PNG, WebP, AVIF, HEIC), the one-line commands, and what quietly breaks when you pick the wrong one. Guide