Author serhiy.storchaka
Recipients ezio.melotti, mark.dickinson, packetslave, serhiy.storchaka, terry.reedy
Date 2013-08-05.08:20:11
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <1375690813.22.0.207825558113.issue14323@psf.upfronthosting.co.za>
In-reply-to
Content
> Can you add a reference for the coefficients?

I have only link to Wikipedia which refers to Code of Federal Regulations §73.682. This link (http://en.wikipedia.org/wiki/YIQ) already mentioned at the top of the file.

> (You claim about the current rounding is not exactly correct. While .28*g rounds .277 rather than .274, the current .52*g rounds the non-FCC .523 rather than the FCC .5251. So I avoided making the claim in the suggested entry. It is not important.)

A sum of coefficients in this line should be 0 (Q=0 for R=G=B).

Patch updated. I added a What's New entry and update to use of unittest.main(), rewrite rgb_to_yiq() in the form as in Wikipedia (it uses less multiplications) and write coefficients in yiq_to_rgb() with maximal precision (as calculated with Python).
History
Date User Action Args
2013-08-05 08:20:13serhiy.storchakasetrecipients: + serhiy.storchaka, terry.reedy, mark.dickinson, ezio.melotti, packetslave
2013-08-05 08:20:13serhiy.storchakasetmessageid: <1375690813.22.0.207825558113.issue14323@psf.upfronthosting.co.za>
2013-08-05 08:20:13serhiy.storchakalinkissue14323 messages
2013-08-05 08:20:12serhiy.storchakacreate