The setting that controls how many shades of gray a scanned fax page can use, separate from contrast or resolution.
- Gray scale is the setting that controls how many distinct shades of gray a scanned page is allowed to use, from pure black-and-white up to a wide tonal range.
- It's a separate control from contrast, which lightens or darkens the whole page, and resolution, which controls sharpness and detail.
- A document that's mostly text needs very few gray shades, while a photo or shaded diagram needs many more to look accurate.
- Fax.Plus's High Definition mode supports the extra gray-scale detail a photo or continuous-tone image needs, unlike its Standard mode built for plain text.
What Does Gray Scale Mean on a Fax?
Gray scale is the setting that controls how many distinct shades of gray a scanned page is allowed to use when it's converted for fax transmission, from a strict black-and-white (bi-level) image up to a wide range of intermediate tones. It's a different control from the contrast adjustment, which lightens or darkens the whole page rather than changing how many shades it can contain.
Why Gray Scale Matters for Fax Quality
A page that's mostly typed text doesn't need gray scale at all, pure black-and-white reproduces it perfectly and transmits fastest. A photo, a shaded diagram, or a document with a logo or watermark needs several shades of gray to look accurate once received, otherwise fine detail collapses into solid black or disappears into white. This conversion happens during the initial scan, before the page is compressed and sent, and it works alongside a page's resolution setting to determine how faithfully the final page reproduces the original.
A Common Case: Faxing a Document With a Logo or Watermark
An office preparing a fax that includes a company logo and a faint background watermark needs the gray-scale range preserved, not flattened to pure black-and-white, or the logo and watermark blur into an unreadable smudge once the page is compressed and transmitted.
FAQs
Is gray scale the same as contrast on a fax?
No. Gray scale controls how many shades of gray a page can use, while contrast controls how light or dark the whole page reads. They're adjusted separately.
Does gray scale need to be turned on for a plain text fax?
No. A page that is mostly typed text reproduces perfectly in pure black-and-white and transmits fastest without it. Gray scale mainly helps photos, shaded diagrams, and logos or watermarks come through accurately.
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