High Quality Desktop Background Free Photos Pictures Images 2013
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Resolution refers to the number of pixels in an image. Resolution is sometimes identified by the width and height of the image as well as the total number of pixels in the image. For example, an image that is 2048 pixels wide and 1536 pixels high (2048X1536) contains (multiply) 3,145,728 pixels (or 3.1 Megapixels). You could call it a 2048X1536 or a 3.1 Megapixel image. As the megapixels in the pickup device in your camera increase so does the possible maximum size image you can produce. This means that a 5 megapixel camera is capable of capturing a larger image than a 3 megapixel camera.The computer screen you are looking at right now is set at a particular resolution as well. The larger the screen, the larger you likely have your screen resolution set. If you have a 17" monitor, likely you have it set at 800X600 pixels. If you have a 19" screen it is likely set at 1024X768. You can change the settings but these are optimum for those screen sizes.
Now, if your monitor is set to 800X600 and you open up an image that is 640X480, it will only fill up a part of your screen. If you open up an image that is 2048X1536 (3.1 megapixels) then you will find yourself moving the slider bar around to see all the different parts of the image. It just won't fit. (To see the spider above at this resolution, (Warning! 536 Kb file!), click here. Add to that the fact that the computer monitor has a finite number of pixels per inch available (like 72) so if you are going to display your image on a monitor only, you would want to drop the quality down to 72 to save file space. If you are going to put your image on a webpage or email it to a friend then you will want to first make it a useful size. Not too big, not too small. Maybe 200-300 pixels high would be a nice size. You can also reduce the size of the file (not necessarily the size of the image) so it loads faster. You reduce the file size by compressing the image (see the next question).n addition to image size, the quality of the image can also be manipulated. Here we use the word "compression". An uncompressed image is saved in a file format that doesn't compress the pixels in the image at all. Formats such as BMP or TIF files do not compress the image. If you want to reduce the "file size" (number of megabytes required to save the image), you can choose to store your image as a JPG file and choose the amount of compression you want before saving the image.
JPG compression analyzes images in blocks of 8X8 pixels in size and selectively reduces the detail within each block. At higher compression rations, the block pattern becomes more visible and there may be noticeable loss of detail, especially when you attempt to make prints larger than recommended. The subject and pattern in the image is also a factor. For example, a picture of the blue sky can be compressed quite a bit without any noticeable effects but a picture of a colorful bird would "pixelate" quite quickly. Take another look at the two images at the top. The first is somewhat compressed, about 200 pixels high (size) and the file is only 14Kb. The image on the right is the same size but compressed quite a bit more reducing the file size to 4Kb.
By using JPG compression, you can keep the physical size of the image the same and reduce the amount of disk space required to store it but you will be sacrificing the quality of the image.
High Quality Desktop Background Free Photos Pictures Images 2013
High Quality Desktop Background Free Photos Pictures Images 2013
High Quality Desktop Background Free Photos Pictures Images 2013
High Quality Desktop Background Free Photos Pictures Images 2013
High Quality Desktop Background Free Photos Pictures Images 2013
High Quality Desktop Background Free Photos Pictures Images 2013
High Quality Desktop Background Free Photos Pictures Images 2013
High Quality Desktop Background Free Photos Pictures Images 2013
High Quality Desktop Background Free Photos Pictures Images 2013
High Quality Desktop Background Free Photos Pictures Images 2013
High Quality Desktop Background Free Photos Pictures Images 2013
