Line widths in diy decals.

Making simple straight lines is the easiest task in homemade decals. I needed some boot topping strips for a warship I am working on.  They needed to be about 0.090 inches. I keep forgetting how to set the line width in my graphics program- how many pixels wide is that.  Did the algebra- thought I'd post it here for other folks.

Okay, I needed lines 0.090.  My graphics program, like so many, sets line widths in number of pixels.  I typically set resolution on decals to 300 dpi (see note below about dots per inch- dpi).  Okay, the width in pixels then is number of pixels (or dots) divided by the dpi, W =  N/dpi  .  Rearranging, N = W x DPI.  So,

N = 0.090 x 300, or 27.  Set the line width to 27 pixels and they came out right on the money.

I wish graphics programs would not use the term dpi is the same thing as pixels per inch, ppi, as in graphics printing a dot is NOT a pixel.  But, they still do , and so I used the terminology here that the graphics programs do.