How to increase the resolution of the pictures

One of the important properties of digital images, directly affecting their display and printing, is resolution. The resolution is expressed in dots per inch and sets the ratio between physical dimensions of the raster and its geometrical dimensions. Sometimes the resolutionm erroneously called the dimension of the raster image. The resolution value is stored in the image files. Images taken with digital cameras and other devices for taking pictures are often low resolution, which is perfect for viewing them on the screen. But in this case, before printing, it makes sense to increase the resolution from the pictures.

You will need

• Graphics editor Adobe Photoshop.

Instruction

1. Open the photo in Adobe Photoshop. To do this in the main application menu select "File" and then click "Open" or hit "Ctrl+O". In the appearing file selection dialog navigate to the directory with the photo, select photos in the list and click "Open".
   
2. Open the dialog box for changing the dimensions and resolution of the image. Press Alt+Ctrl+I or select menu "Image" and "Image Size...".
   
3. Change the resolution of the image. Copy to clipboard the value of the "Width" control group "Pixel Dimensions" dialog "Image Size". Set the mode to proportional changes in the fields "Width" and "Height" if it is not installed. To do this, click on the chain next to the boxes. In the drop-down list, the next field for "Resolution", select "pixels/inch". Change the field "Resolution". Enter the requested resolution value. Paste from the clipboard the value in the "Width" control group "Pixel Dimensions". Click "OK" in the dialogue.
   
4. Save a copy of the image. Press Alt+Ctrl+S or click "File" and "Save As...". Set the save options in the dialog. Click "Save".