Picture resolution is the amount of pixels embedded in an image. A photo taken on your digital camera may have a width of 2048 pixels and a height of 1536 pixels -- this means that the image has an overall size of 3,145,728 pixels (3.1 megapixels). You can increase the megapixel value of an image and also maintain its output print size by increasing the resolution of the image in an image software program.
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Things you need
- Image manipulation software
Launch your computer's image manipulation program and load the picture file you wish to edit. Do this on most image software programs by clicking on the "File" menu button and selecting the "Open" option from the menu -- locate your file in the browse window and click "Open" again to load the image.
Locate your image program's size editing option. Do this in Photoshop by clicking on the "Image" command menu button and selecting the "Image Size" option from the drop-down menu. Your software program should open a new Image Size window.
Check the correct boxes in your image program's edit image window to ensure your picture will be resampled. Do this in Photoshop by ticking the "Constrain Proportions" and "Resample Image" boxes -- this will ensure that your pixel values can be increased (thus changing the megapixel value) but will also maintain the image's print size.
Increase the pixel size by entering a higher value into the pixel-per-inch field. Increase this value and your image's megapixel value will also increase. If you have an image that is 50 pixels per inch at 3.02 megapixels, entering 75 into the pixels-per-inch box will increase the image size to 6.78 megapixels. Programs such as Photoshop will display the megapixel size for you as you type in the new number.
Notice that "Document Size" field has remained the same. This simply means that your output print size for the image will not be altered or upsized. However, the web size of the image and your editing size will change.
Click the "OK" button to confirm your new megapixel size.
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