Wednesday, 29 January 2014

Image resolution describes the amount of detail an image holds. More simply, Resolution is the quality of the image. As the resolution goes higher, the image becomes clearer. It becomes sharper, more defined, and more detailed as well.  The resolution of an image is directly dependant on the dimensions, as we increase the size of the image, the resolution decreases and vice versa.

Digital images are made up of thousands of pixels (blocks of colour), and the number of pixels in the image will determine how high the image's resolution is. Image resolution, often referred to as ppi (Pixels per Inch) or dpi (Dots per Inch), is the number of pixels or dots within a one-inch area. Size and resolution of images are inversely proportional to each other.

Browse High Resolution Images gallery

Concluding, the image's resolution is the number of pixels divided by the size it is being viewed at. For example, if the image is 720 pixels wide by 720 pixels tall, and it's being viewed at 10 inches square, it has a resolution of 72 pixels per inch.

High Resolution Images Vs Low Resolution Images

High Resolution means that the image contains more than 300 dots per inch (dpi). If you were to take a magnifying glass and look at a picture on a piece of paper, you can sometimes see the actual dots or specs of colour information that create the image as a whole. The higher the resolution, the harder they are to see because they are tight and concentrated thus creating a very clear picture.

Low Resolution means that there are less than 300 dots per inch (dpi). This basically means that if you were to take a magnifying glass to your image, you would see fewer specs of colour in it making the picture very grainy looking because the dots are so much clearer.

Because of space and time most images on the web are at 72 dpi. Having a lower resolution means less download time for smaller images. While High Resolution images are larger and take a longer time to download.

Significance of High resolution images

Resolution is quite important, as the wrong resolution in the wrong circumstances can look terrible. The pixels are incredibly small and should be completely invisible to the naked eye when you are viewing an image at full size. And the high resolution images are so sharp that one does not or rarely see any blurriness in it.

The resolution of the original image is the critical factor. People sometimes make the mistake of thinking they can take a low resolution image, put it in Photoshop, and then change the resolution to 300dpi to make it a high resolution image. While Photoshop can usually effectively double the resolution of an image using interpolation, that's about the limit. Changing a low resolution pixilated original image in Photoshop to 300dpi will just result in a very large file size, 300dpi image that is still pixilated.

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