This function is available from the Edit menu. It will change the resolution (dots per inch) of the image. The resolution value is saved in an image file's header. If this value is changed without altering the image's pixels, then, when the image is printed, it will be a different size. If this value is changed, and if the printed size must remain the same, then the image's pixels must be altered (the image must be scaled).
These two choices are available:
A) Lock the number of pixels. No pixels will be added or removed. It just changes the definition of how big the pixels are. The larger the dpi number, the smaller the pixel when it is printed. This simply changes the resolution value stored in the image header.
B) Lock the image print size. The image will be automatically scaled up or down to maintain the original print size.
For example, the original image is 72 dpi and 288 x 144 pixels, with print size of 4 x 2 inches. The image resolution is changed to 144 dpi.
A) If the number of pixels is locked, then when the image is printed it will be 2 x 1 inches.
B) If the print size is locked, then the image will be automatically scaled to 576 x 288 so that when printed it will be 4 x 2 inches.
Enter the desired resolution for the horizontal and vertical dimensions. Normally, the same value should be entered for each dimension.
- 72 dpi (dots per inch) is the standard screen resolution.
- 144 dpi is the best an ImageWriter can print.
- 300 dpi is the best many laser printers can print.
For best results in printing a 72 dpi image at high resolution, set the resolution to 288 dpi instead of 300 dpi. This results in a cleaner image because the scaling will be by a factor of 4 rather than 4.17.
