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BMP import to large but within standard size?

treahuggs

Im trying to create a unique outline that will perfectly fit a light housing I have. I have created a BMP that is only two colors and it imports fine. But when I try to finish the import and click "OK" I get the error listed below (Image is to big basically).

If I do edit the picture to 800 it will import but it is amazingly tiny. No where near the size I need. y question

 

Size of the bitmap is 4.240"x2.260" and the size of the PCB is 3.75"x2.21"

If the size of 4.2 " is really to big I can make it a bit smaller but when i did that before like I mentioned it got super tiny OR just doesnt show up at all.

 

My question is what am I doing wrong and what do I need to do to replace the lined outline with my bmp curved outline? (Pictures for ref)

 

If you need anymore information let me know, kinda hard to explain my issue, ive searched for answers and can't find anything.

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  • in reply to treahuggs

    Hi Trea,

     

    I'm a non-expert on the BMP import but just in case you don't get any other answer in your required timeframe, I think the best way for an outline is to draw it point-to-point with lines. If you can describe your outline with numerical measurements (i.e. co-ordinates) then you can type it into the EAGLE command line as a set of WIRE commands. In other words, any complexity outline can be achieved in this manner. I don't think a BMP is an appropriate description of an outline, because there will always be the risk of accidentally having it scaled wrong.

    Your desired outline looks like a set of curves. You could replace this with straight lines fitting a curve. You could always go back and then replace some of the lines with a nearest-fit curved line in EAGLE if you really wanted it to look even smoother although that's often not necessary inside an enclosure.

  • in reply to shabaz

    Shabaz,

     

    Thank you for the reply. Currently it is point to point but larger lines. I have tried to use curved lines but they are unable to replicate the original outline of the housing the boards are going in. Doing the point to point is possible i agree but that would be thousands of points to get a seemingly nice curve. From my understanding a BMP import converts the BMP into lines for the board. I can still make do with the outline as I have it, I just would love to get a perfect fit. I may once I get more free time work on creating enough point to points to appear to have a curve.

  • in reply to treahuggs

    Hi Trea,

     

    A BMP import doesn't convert to lines, it converts to tiny squares/rectangles (many of them) from memory. The board factory might not like that. All in all, it is safer to do it line-by-line, and then find the closest curved lines once you've drawn the lines in EAGLE. It should be possible to approximate your shape very easily (and to within a fraction of a mm, to meet whatever tolerance you require) as a result.

    Here is an example, not of an outline but of a drawing on a PCB, this is less than 500 lines of points (all straight lines no curves, even though they look like curves), done in EAGLE:

    image

  • in reply to shabaz

    Thank you for clearing that up. I was able to figure it out!  I appreciate you taking the time to helping.