Chuck,

yes the HW-101 is djvu not jpg. In my opinion that is not a good quality =
diagram; of course it can be useful, even if some components values =
cannot be clearly read. The EICO 722 was recently changed from jpg to =
djvu, but quality is about the same.

I am not a defensor of any particular compression scheme. What I would =
suggest the BAMA page keeper is to give clear instructions to people =
wishing to upload manuals, so that even the unexperienced guys can =
contribute in useful manner. At that regard the B&W lossless schemes =
(gif, png or whatever else, don't care) yield the advantage that there =
is little to play with, and people unfamiliar with compression schemes =
so run less risks to upload poor diagrams.

Thanks for the chat and 73

Tony, I0JX

"Chuck Harris" ha scritto nel messaggio =
...
Tony,
=20
I went looking, and as far as I can tell, bama doesn't have a jpeg of =
the HW101
on his site, only djvu.
=20
If you set the quality of the jpeg rendering to 77%, you get about
the same size as a gif, and the "dots" you are complaining about
go away. Add some smoothing, and you can get the same result
with around 50%, and 1/3 the file size.
=20
Gif works, but there are better lossless algorithms readily available. =
The
typical Gif schematic I see is B&W, stored in full 24bit color, with =
large
borders around the important stuff. And as a result, they are very =
large
in size. Some simple adjustments would improve this, of course, but =
most
folks are so dumbed down that they haven't a clue about things like =
that.
=20
I have worked with numerous schematics of very poor quality, and =
somehow,
I can always get the job done. But as always, YMMV.
=20
-Chuck Harris
=20
Antonio I0JX wrote:
Chuck,
=20
jpg is perfect for images and photo, but is not good when there are =
sharp black / while transitions as it occurs for
circuit diagrams and text in general.With jpg, unless you reduce the =
compression level a lot, you will typically see
small "dots" scattered around the lines representing the circuit =
wires. And wires do not appear "solid" any more. So,
diagrams do not come out clean.
=20
For schematic diagrams quality is the priority, not file size. =
Lossless compression (gif, png) is the only way to get
a good diagram.
=20
If you have time try and download the "improved" HW-101 schematic =
diagram from BAMA (or much better its mirror site
http://bama.edebris.com/manuals/), you can judge yourself whether a =
technican can work comfortably with that.
=20
73
=20
Tony, I0JX