I have done some more testing on the Stipples with QDOS, QPC2 & SMSQmulator .
There were a number of inconsistencies until I realised that SMSQ defaults with borders around the standard windows.
As the Stipple block should start at an even position, this may mess up the starting pixels with an odd border width.
Once these were eliminated only Stipple 3 remained that reversed the colours.
- ColoursM4v2.png (8.29 KiB) Viewed 184 times
Assuming the Jan Jones Book is correct, then the Oliver Fink Tool also has the S3 example reversed but strangely the preview window is correct. Doing a PAPER 244 on window #1 (no border) has reversed the colours as expected (SMSQmulator).
(Apologies to anyone who has trouble distinguishing Main Green & Contrast Red.)
BSJR