Calibration Data: How the Pages were scanned,
and place the number "300" and "120" DPI (Dots Per Inch) came.

the DPI number "120" are "Little Less than 120 DPI"
and DPI number "300" are somewhere around "295 to 299dpi"

All the pages in this site, starting from Issue #23 (1984-10) to Issue #79 (1989-12)
are scanned using FlatBed Scanner the Epson GT-F520, with the Software used to scan is
the "Yonde Koko ver.11," with its mode in 400dpi Gray Scale and sometimes in Color.

Pictures were then ReEnhanced by using the shareware "XnView," then let them shrink down
to 300dpi by ImageMagick "convert" command, sometimes by using XnView (shareware.)
in both cases, the OS used was the MS-Windows XP, XnView for MS-Windows version,
manytimes in "convert" command by Cygwin console. (I like the Unix like console environment )
in both cases using "XnView" and "convert (ImageMagick)" the number 75% were used to shrink them down.

120dpi jpeg images were made in two ways, in early days, they were made by shrinking down 300dpi images, (40% shrunk)
in latter days they were made from 400dpi shrinking down to 120dpi directly.(30% shrunk)

Two Examples are shown here.
following scanned papers are with very exact in 1/4 Inch grids.

300dpi Data / 120dpi Data A4 300dpi Data / 120dpi Data

Please check up the pictures above to know the exact idea.
The Grids are in very exact length, made by programs, by directly commanding out in PDF language.
For small grids, they are showing 1/4 inches, the large grids are in inches.

The important thing I want to point out in here is NOT the scanned page image.
The important thing I want to point out are the dots number of shown grids length.
and you will know,

the DPI number "120" I say through out this site are actually "Little Less than 120 DPI"
and DPI number "300" are which not exactly "300 Dots Per Inch" but rather somewhere around "295 to 299dpi"


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The Sites Includes the "Atari ANALOG Computing Magazine Archive"