On Thu, 01 Jan 2004 13:57:16 -0500, Alan King <
alan@...> wrote:
> Why do you jump to this from a little bit of black left on the board?
> You're likely using several times too much solvent if you're getting your
> board spotless. Or your board composition is different from his so is
> more slick and washes more easily. Or any of a half dozen other more
> sensible reasons than the acetone is melting the board to any degree
> worth noticing..
>
> Even if it actually did what you're guessing it wouldn't be a cause for
> concern at all since it evaporates fast and isn't going under the traces.
> But it's not, it's just drying and leaving the toner residue on the
> board.
>
He said it solved the board later.
>>> Yes, acetone was etching into the fiberglass. (from mike)
I was right i think.
and it looks not good with that smears.
> >Please delete the tiff image, the jpeg has no data loss and safes LOADS
> of
> space.
>
> You should note for reference that JPEG is actually a lossy compression.
> Fine for general pictures like this but for anything you really need no
> degradation it's not the right format. Magnify a small section of the
> tiff and jpeg and you'll see zones in the jpeg edges, the hallmark of
> different data. Enlarge a JPEG beyond a certain point set by the
> compression level and it'll look terrible, the compression takes out the
> fine detail beyond a certain point. Doesn't matter for most pictures
> though.
>
>
correct.
I compressed his image a bit strong, you can see it if you look good.
you can't see anything (on 400% scale) if you set compression to minuimum
and the image is still
much smaller.
jpeg is not lossless compression, but you loose no valuable data if you use
it right.
like MP3.
I wanted to keep things easy and short and maybe i choose the wrong words.
still no harm done i would say. thank you for the correction.
Alan
>
>