Our Terminology
Archival Image
A digital image taken at the highest practicable resolution and stored securely
Color Accuracy
Fidelity of color in the scanned image with that in the original
Color Cast Removal
Removal of an unwanted 'wash' of color, performed in an image editing
application
Color Correction
Performed with image editing software or scanning
software, ensuring scanned color fidelity with the original
Compression
An algorithm
that is applied to a digital image to reduce its file size. Compression can be
either Lossy or Lossless
Contrast Adjustment
Adjusting the difference between the lightest and darkest areas of an image
Cropping
A method of discarding extraneous material from a digital image e.g. borders
created during the scanning process
JPEG (JPG)
A compressed file format widely used today in digital
cameras, computer applications, email and web pages. Named
after the Joint Photographic Experts Group who devised it. The JPEG format
compresses images but sacrifices image detail (lossy compression)
Lossless Compression
A compression algorithm
that reduces a file size but does not loose any data. The uncompressed image is
identical to the original
Lossy Compression
A compression algorithm
that reduces file size by actually removing data from the image. The
post-compressed image is different from the pre-compressed image, even though
they may look identical (visually lossless)
LZW.
A form of lossless compression available in TIFF files. LZW compression is
proprietary. The acronym LZW is derived from the names of its creators
Lempel-Ziv and Welch. We can provide this type of file upon request.
File size reduction is only about 25%.
Refreshing
Transferring digital data to new storage media to avoid the effects of
media deterioration.
Scanning Resolution: The amount of information that is captured during
the scan -- expressed as Dots (pixels) Per Inch.
Thumbnail Image
Small, low resolution
preview, often hyper linked to a high resolution version of the same image
(TIF)
Tagged Image File Format. A widely used non-compressed file format used today in high end
graphic applications and for archival purpose.
White Balance
An adjustment made by a capture device to correct for any color bias
due to the color temperature of the light source
