very program has its own JPEG Quality settings; there is no universal standard. Photoshop has settings between 0 and 12. IrfanView (a handy little editing utility) has settings between 0 and 100. The relationship between settings in different programs is anything but linear. PW Pro Quality = 70% (8.9 kB) is roughly equivalent to Irfanview Quality = 50% (7.9 kB) and Photoshop Quality = 3 (33 kB in Photoshop CS; 13.8 kB in Photoshop 6). Photoshop files are considerably larger, even though have no embedded ICC profiles, perhaps because they have extra space reserved for Exif data (digital camera settings). This can be a disadvantage for small images used for Web display.
Many digital cameras store images in JPEG format. This can lead to problems because image quality can deteriorate when images are saved and reloaded in JPEG format. The deterioration is tiny when files are saved at the highest possible JPEG quality, but it can become serious if less than maximum JPEG quality is selected. JPEGs should be used with caution for images intended for high quality quality printed output. If you plan to do much editing on a JPEG image, it's best to convert it to TIFF. No quality is lost when images are stored and reloaded in TIFF format.
Additional file formats You may occasionally encounter these, but they're not recommended for general use.
Macintosh users should add the appropriate three leter suffix (JPG, TIF, PNG, etc.) to file names to make it easier for us Windows users to read.
very program has its own JPEG Quality settings; there is no universal standard. Photoshop has settings between 0 and 12. IrfanView (a handy little editing utility) has settings between 0 and 100. The relationship between settings in different programs is anything but linear. PW Pro Quality = 70% (8.9 kB) is roughly equivalent to Irfanview Quality = 50% (7.9 kB) and Photoshop Quality = 3 (33 kB in Photoshop CS; 13.8 kB in Photoshop 6). Photoshop files are considerably larger, even though have no embedded ICC profiles, perhaps because they have extra space reserved for Exif data (digital camera settings). This can be a disadvantage for small images used for Web display.Many digital cameras store images in JPEG format. This can lead to problems because image quality can deteriorate when images are saved and reloaded in JPEG format. The deterioration is tiny when files are saved at the highest possible JPEG quality, but it can become serious if less than maximum JPEG quality is selected. JPEGs should be used with caution for images intended for high quality quality printed output. If you plan to do much editing on a JPEG image, it's best to convert it to TIFF. No quality is lost when images are stored and reloaded in TIFF format.Additional file formats You may occasionally encounter these, but they're not recommended for general use. Macintosh users should add the appropriate three leter suffix (JPG, TIF, PNG, etc.) to file names to make it easier for us Windows users to read.
การแปล กรุณารอสักครู่..