What is DPI?
DPI means dots per inch and is commonly used when preparing images for print. It helps relate pixel dimensions to physical print size.
What is the difference between DPI and PPI?
PPI describes pixels per inch in a digital image or display context. DPI is often used for printer output. In many image tools, people use the terms together for print planning.
What DPI should I use for printing?
300 DPI is a common target for sharp prints viewed up close. Posters or large prints viewed from farther away can often use lower DPI.
Is 300 DPI necessary for printing?
Not always. It is a useful benchmark for high-quality prints, but the right value depends on viewing distance, printer, paper and image detail.
What image size do I need for A4 printing?
Multiply the A4 print size in inches by your target DPI. A print size calculator can convert pixels, inches, centimeters and DPI for you.
How do I calculate image size for printing?
Divide pixel width and height by DPI to get print width and height in inches. Convert inches to centimeters if needed.
How many pixels do I need for a 4x6 photo?
At 300 DPI, a 4x6 inch photo needs about 1200 x 1800 pixels. Lower DPI can print from fewer pixels but may look less sharp close up.
Does increasing DPI increase image quality?
Changing a DPI tag alone does not add pixels or detail. It changes print size interpretation in some software.
Can I change DPI without changing image dimensions?
Yes. A DPI changer can update the DPI/PPI metadata while keeping the same pixel dimensions.
What is the relationship between pixels, DPI and print size?
Print size equals pixels divided by DPI. More pixels allow a larger print at the same DPI.