Resizing an image (also known as scaling) in your document is not the same as resampling (performing math to add or subtract pixels in relation to the image’s size). Again, the same number of pixels are in the image, but the result can possibly look just as distorted my making the image look over-sharpened. Degradation of the image quality can also happen when the image is reduced. This is why the quality of a raster image degrades when enlarged. So enlarging the 100 pixel wide image to 700 pixels wide spreads out these pixels, resulting in an image of only about 10 pixels per inch.īy enlarging this image I have reduced its resolution. Well, we’re still working with only 10,000 pixels here. Looking at the 7x enlargement on the diagram, you will see how I took the original image and tried making it larger. The diagram below shows the example image with close-ups of the pixels. So when viewing a photographic image on a computer screen, it is actually a series of points that your eyes and brain mix together to produce the appearance of a full color image. This number of pixels will never change for this specific image file.Įach pixel is a single point of the image that contains only one color. This means that the image has 10,000 pixels to work with. The image to the right is a 100 pixel x 100 pixel jpeg image at 72 pixels per inch. Raster images have a fixed number of pixels in them. These images are usually low-resolution (or screen-resolution of 72 pixels per inch). GIF, JPEG and PNG are the most universally accepted image formats for the web and screen presentations. Photographic (continuous tone) images, supports image transparency in millions of colors Photographic (continuous tone) images, millions of colors, no transparency Raster Formatīest used for images containing text, flat color or images with 256 or less colors, supports images with a transparent background Raster Images are pixel-based– you may already know most of them: GIF, JPEG, PNG, TIFF (and sometimes EPS) are the most common formats used today. The two categories of image types we will discuss here are raster images and vector graphics. In this post, I will explain what the differences are and how you can put this knowledge to use. With so many graphic formats one can use these days, how do you know which one to use for your project? sketch), Encapsulated Postscript (.eps) or Portable Document Format which has embedded vector information! (.pdf).Vector, GIF, Illustrator, TIFF, JPEG, PNG, EPS, Raster, PSD – what does it all mean? In order for images to be vector they have to be created or traced in vector software then saved in a format that saves the vector information, like a native software format (.ai. This is not true and when opened by the artwork department, the image will still be a raster image. Often times people will take a regular raster image, open it and save it in a vector software, thinking that this makes it a usable vector image. Vector images are created in vector software like: Adobe Illustrator, Corel Draw or Sketch. They can also offer superior color separation systems which makes them perfect when using for screen printing. These images are easily resized in a vector computer software program and are a better quality graphic than raster images. This allows the image to be scaled or modified ad infinitum without loss of quality or resolution. Simply put vector files are a type of graphic image that uses mathematical algorithms and not pixels to create artwork. Vector images or artwork and it’s technical definition is a bit complicated to understand. To avoid having to pay additional artwork charges it is best to provide your printer with vector artwork or at the very least a high quality (300 DPI) raster image. Another problem low quality artwork or non-vector images have is the ability to be altered or prepared correctly for printing, like separating colors, reducing colors, or creating any separating space that is sometimes needed for various printing. If these types of low quality images are used and then enlarged, “pixelization” or blurriness will occur. ![]() Images, if saved directly from the internet, will have a resolution of 72 DPI, which is often times TOO LOW of quality to be blown up and work well on a t-shirt or other high quality prints. ![]() Raster image resolution is represented by DPI (dots per inch) this number indicates how many pixels a particular image consists of in a one inch space. Known also as Pixel based artwork, raster images are the most common form of digital imagery found on the internet, known by familiar files names such as JPEG’s, TIF’s, BMP’s or PNG’s.
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