Recap: For all electronic displays of your image, PPI is almost always irrelevant.ĭata compression reduces the number of bytes used to store or transmit data, with acceptable loss in quality.Ĭompressing an image aims to reduce the physical amount of data the file uses and is totally unrelated to the resolution or size of the image. Good news you can generally ignore this too. This is only of interest to printers and printing companies. Honestly, ignore it.ĭPI (Dots Per Inch) is simply the smallest resolution a printer can print at. When would you need specify resolution this way? Generally never, because your friendly neighbourhood printing shop will print at the size you ask them to. These are just different ways to represent the number of pixels in an image. So, rather than specify a pixel-resolution, you can specify an image size and the PPI.
BEST PRESETS FOR LIGHTROOM JPEG FILES HOW TO
If you know this, then you can use this information to control how to resize your image so that it’s presented at the right physical size (in inches or centimeters).
It refers to how many pixels a screen has in an inch of display real-estate. PPI simply relates to the resolution of a display device, not an image. Also, thankfully, most of us photographers can totally ignore them as they relate to how images are displayed or printed. They are incorrectly used interchangeably all the time, but they are very different. Smaller Images: If image size is smaller than the display size then you’re in trouble.The image will either be rendered too small, or it will be stretched to fit, which will reduce the sharpness in your image.Ī note about these concepts.That impacts storage and speed of the website, with no visible gain.Some website platforms such as Squarespace automatically create smaller versions of your images to try to minimise this problem. Larger Images: If image size is larger than the display size, this is usually OK, as the website or social media platform will usually ensure it’s displayed at the right size.Taken to the extreme though, if you’re using a 42MP image for a web page that will display it at 800x400px, then you are using a huge amount of data unnecessarily.
The other important factor is the display size – the number of pixels that the image will occupy on the screen that it’s displayed on. The resolution of an image is the size in pixels of its horizontal and vertical edges, usually expressed as something like 6016x4014px. If it’s too big, it can reduce your website’s performance and SEO. You might as well use an image that’s the right size, which will save upload time and storage space.Īnother reason is that some websites will deliver the image to the viewer’s device at the same resolution it was uploaded, letting the client’s device scale it correctly.
BEST PRESETS FOR LIGHTROOM JPEG FILES FULL
Why do you need to resize an image? It’s usually because most platforms on the web and social media don’t display images at full resolution. My Lightroom Export Images dialog, showing JPEGMini which I use to reduce file sizes (reviewed here).
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