Filters for photography
Colored filters
For example:
Y: Yellow
YG: Yellowish green
O: Orange
R: Red
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Depth of Field
To make a deeper DOF, we can use:
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Perl and Character Encoding
By default, Perl is for ASCII systems. If you need Perl for other character
encoding, you better use Perl 5.8 and take the following precaution:
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Acid-free paper
Often I read from the covers of a book that claim it was printed on acid-free paper. I thought it was some environmental protection issue, but actually it was not.
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Sample code of using Berkeley DB
Berkeley DB is ubiquitous but a bit complicated. Although there are some
alternative out there and some wrapper exists, it is good to know about how to
manipulate it.
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