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- IMPORTANT
- When using a high-resolution image, you MUST first open the image in an
- image-editing or file conversion application and re-save the file in a
- format other than JPEG. THIS IS A CRITICAL STEP TO MAINTAIN THE QUALITY
- OF THE IMAGE. Check with your service bureau to determine the best file
- format for your project.
-
- TECHNICAL SPECIFICATIONS: BITMAP FILES
- The files on this disk have been saved in a variety of convenient formats,
- canvas sizes and resolutions.
-
- LARGE AND MEDIUM CANVAS SIZES
- Each file is saved with two canvas sizes: Large and Medium. In general,
- large-canvas size files are between 28 and 35 MB in file size to
- accommodate a letter-sized bleed image at 300 dpi. The medium-canvas
- size files are exactly one-half as wide and tall as their large-canvas size
- counterparts, making the file sizes about one-fourth as large.
-
- HIGH-RESOLUTION AND LOW-RESOLUTION FILES
- Each large-canvas and medium-canvas image is saved at 300 dpi for high-
- resolution reproduction and at 72 dpi for position-only placement. The
- low-resolution files possess exactly the same canvas dimensions as their
- high-resolution counterparts to provide precise and efficient image
- replacement when the file is ultimately prepared for high-resolution
- output.
-
- TIFF AND JPEG FORMATS
- The high-resolution versions of both canvas sizes are saved as JPEG files;
- the low-resolution versions are saved as TIFFs. Both formats are saved in
- RGB color space. Again, check with your service bureau and/or printer to
- determine when and how the conversion to CMYK color space should be
- made.
-
- FILE NAMES
- Images of either resolution/canvas size can be identified by the first six
- characters of the file name. The file name suffix identifies the specific
- resolution and canvas size of the file:
- H.JPG = Large Canvas, High Resolution
- HL.TIF = Large Canvas, Low Resolution
- M.JPG = Medium Canvas, High Resolution
- ML.TIF = Medium Canvas, Low Resolution
-
- FILE COMPRESSION
- Because the high-resolution images are saved as JPEG images, it is
- important to note a few important features of JPEG compression. While no
- image degradation is noticeable after a single compression-decompression
- cycle, subsequent compressions will begin to soften and otherwise degrade
- the image integrity. To preserve optimum image quality, it is important to
- never re-save the images in JPEG format. Depending on the target
- application and operating system, it is best to save the high-resolution
- images as TIFF, EPS or another format as either uncompressed files or
- files employing "lossless" compression such as LZW compression.
-