- **Patch**: review --> needs_work
- **Comment**:
Setting this back to 'needs_work'
---
** [issues:#5162] Some hooks useful for video production**
**Status:** Started
**Created:** Tue Jul 25, 2017 05:48 PM UTC by Knut Petersen
**Last Updated:** Wed Jul 26, 2017 11:51 AM UTC
**Owner:** Knut Petersen
**Attachments:**
-
[0001-Implement-some-hooks-useful-for-producing-score-vide.patch](https://sourceforge.net/p/testlilyissues/issues/5162/attachment/0001-Implement-some-hooks-useful-for-producing-score-vide.patch)
(7.7 kB; text/x-patch)
Producing ps or pdf documents intended to be used as
a source for video production requires some changes to
the output at a very late stage.
Often a page needs to repeated more than once with only
changes to some kind of progress bar / line or changes
to the color of a few grobs.
Parts of this postprocessing might be passed to postscript,
parts of this postprocessing might be done in the dump-page
procedure.
Therefore this patch provides a hook to write arbitrary
code to the prolog section of postscript output and a
hook to take over the dump-page process.
Using rgb values < 0 and > 1 for grobs is an efficient
way to pass the information that, when and for how long
an object should change its color to a late state of
processing. Therefore a way to disable the range
check implemented in color? and to disable the precision
restriction in setrgbcolor is provided.
---
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