Homebrew PCBs

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
>
>