Image Tips where Size and Format Matters When preparing photos for printing, there are two main technical considerations. The first is the size of the file image resolution , and the second is the proper final format of the file. Most images are captured in some digital file format. Photo images are often digital to begin with.
For negatives and prints, the image needs to be scanned and saved into a digital format. Digital images can be converted into different file formats depending on how it needs to be used. In general, when file formats are converted, some loss of image quality occurs, so it is best to convert images as little as possible. A Word about Resolution Digital photos are bitmapped images, meaning the image is composed of pixels or a grid of color squares.
These pixels are defined by color, intensity saturation , and light and darkness value. The larger the number of pixels in a specific area of an original image file, the better the resolution.
You can always scale an image down reduce in size proportionally to improve quality, but you lose quality if you try to scale up enlarge proportionally. These files should be saved in CMYK mode, and bigger is better. TIFF files are not Web compatible. The image file can be compressed to a much smaller file size than the TIFF files. However, with more compression there is more loss of image quality. JPG files are popular for computer and Web use, since the file size is smaller, yet it has a good range of color depth.
Because of its small file size, it is useful for Web images. The file size is small and allows a much better color range than GIF. It is an exact representation of an image area on a computer screen. Image size is directly proportional to the number of pixels in the image.
The format also has limitations that make it less flexible. Bottom Line on File Formats: For screen projects Web viewing, etc.