DXF to high resolution Bitmap (4000 per millimeter density). The final Cropped Bitmap Height is fine, however the width is 1 pixel off. Can you help?
N
Numerical Support Team
started a topic
about 8 years ago
Here here is a 10mm x 10mm filled circle.
Bitmap final size: 191.06 MB --- X Pixels: 40000 Y Pixels: 40000
Note: I believe the primary problem you are experiencing is the arc resolution (for your outer circle). Since you are converting from DXF -- remember each circle must be broken down into a series of points mapping the outline of the circle. The more points you allow on a circle, the more accurate the final circle will become. In my sample above I choose: 2000 Points per circle - the default is 360. Rather than set Arc Resolution to 2000 Points per 360 degrees. You would be better setting the Arc precision to a tolerance you prefer. This way small circles will not have 2000 points (which would be unnecessary). See my screen capture for more details: https://numericalsoftware-update.s3.amazonaws.com/tutorials/2016-03-17_7-20-23_ArcResolution.pdf
To permanently avoid this problem (if image alignment must be 100% accurate) -- add at least two square fiducials on opposite ends of the design (for every layer). This is done for silicon wafer manufacturing, and will insure every image aligns 100% - see my sample DXF. https://numericalsoftware-update.s3.amazonaws.com/tutorials/circle10mm.dxf
Numerical Support Team
Bitmap final size: 191.06 MB --- X Pixels: 40000 Y Pixels: 40000
Note: I believe the primary problem you are experiencing is the arc resolution (for your outer circle). Since you are converting from DXF -- remember each circle must be broken down into a series of points mapping the outline of the circle. The more points you allow on a circle, the more accurate the final circle will become. In my sample above I choose: 2000 Points per circle - the default is 360. Rather than set Arc Resolution to 2000 Points per 360 degrees. You would be better setting the Arc precision to a tolerance you prefer. This way small circles will not have 2000 points (which would be unnecessary). See my screen capture for more details:
https://numericalsoftware-update.s3.amazonaws.com/tutorials/2016-03-17_7-20-23_ArcResolution.pdf
To permanently avoid this problem (if image alignment must be 100% accurate) -- add at least two square fiducials on opposite ends of the design (for every layer). This is done for silicon wafer manufacturing, and will insure every image aligns 100% - see my sample DXF.
https://numericalsoftware-update.s3.amazonaws.com/tutorials/circle10mm.dxf
Thanks again, and hope it helps.
Best regards,
Simon