Hi
When trashing my unwanted files etc ( as per screenshot ) the bitmaps disappear.
The draft lines remain–but the bitmaps go.
When dragging all trash onto desktop–the Bitmaps appear.
I have tried unsuccessfully to find which file is causing this.
Please can you advise.
Thanks–Ross–Perth - Australia
Hi,
a bitmap in a drawing is basically only a link to the bitmap location. It is not physically part of the drawing. If you delete or move the bitmap Qcads link to the bitmap is invalid. The bitmap can’t be displayed anymore…
The remaining contour is not part of the bitmap - looks like a trace of it. That is why it is still visible.
Hi Husky—
Thanks for reply.
I have found a way of keeping the bitmap—I import and place the bitmap image onto the DXF drawing (for cutting.)
Remove the laser cutting drawing lines.
Take a screenshot.
I then have a saved file for future printing .
Not perfect but a solution.
Thanks - Ross
QCAD can export to a bitmap too.
Regards,
CVH
Hi–thanks for reply-- please can you tell me how to export a bitmap.
Thanks
Ross
Ensure that only the required content is shown.
Bitmap Export… (XB)
Regards,
CVH
Thanks
Ross–Australia
Hi–Me again
I have managed to keep the Bitmaps as per the attached file. The file is in dxf format and the 24 images are fixed in a 210 x 297 rectangular section.
Is there a way of now changing the background so that the black grid is not seen ( white would be best )
Thanks
Ross
3 buttery print copy.dxf (244 KB)
Please note that bitmap data is not stored in a DXF file.
Only a link is included.
Can you attach: /Users/ross/Desktop/Screenshot 2024-12-07 at 10.45.38 PM.png?
Please start a new topic for an unrelated or new question.
Regards,
CVH
That are features of a screen capture.
It includes all as displayed on the screen.
Including the QCAD background, Grid and Origin marker.
The drawing order of your bitmap is 342.
That of the lines is 339-341.
Meaning that the bitmap is covering the lines.
There are two options.
With the original file(s) export the intended area as bitmap (XB)
→ No additional Grid or Origin markers, free choice of background color.
But maybe you trashed those things too early.
Look in your Recycle Bin or alternative if restoring them is still an option.
The provided screenshot as PNG can be altered with a bitmap application.
Replacing red, Grid grays and black by a color of your choice.
These applications usually have a method to fill areas with the same color with another one.
Regards,
CVH
Hi–thanks again for reply.
the first option–I would have to start again.
the second action–I have looked at bitmap info in Q cad and cannot alter the background–please can you help.
Ross
Hi Roos,
Have you already considered and tested “Wipeout”? It would be another and less laborious way to solve the problem. All the supporting contours for Wipeout exist already in your drawing … 
QCAD is a vector application. MS Paint, GIMP or Adobe Photoshop are bitmap applications.
Bitmap applications work on individual pixels.
In QCAD one can include bitmaps as they are. Rotation, scale, aspect ratio and fading are the only options.
What Husky means …
If you still have the DXF like in the screenshot “Bitmaps go when all old working files are trashed shapes.png” above …
Then you could perhaps use that as a collection of Wipeout boundaries …
But I doubt that it is straightforward.
Probably, it is a good idea to keep intermediate copies until finalizing your project.
Still, sometimes the Recycle Bin or trashcan can be a solution.
The biggest issue I have is that you combine vector art with bitmaps turning the result into a limited bitmap taken as screenshot.
Remind that bitmaps don’t store the actual size except that they are X by Y pixels large.
Also, a single pixel on your screen is not per definition a square, it can be somewhat elongated or it is a triangle of a red+green+blue dot.
Something that is 300 pixels wide will be one inch wide on paper at 300 dpi or 1/2 inch wide at 600 dpi, all depending the scale factor.
Screen resolution is typically far less … 72, 96, … dpi.
Vector art stores the actual size and that can be printed in any scale on paper, as exact as possible.
A mix of vector art and bitmap art can still be treated as exact in any scale.
Regards,
CVH
Hi–Many thanks for suggestions and information—I am getting a much better idea and user.
Your suggestion of Wipeout—Please can you give more details of how to add on.
I have Qcad professional but am confused about how to go about it.
Ross
Hi,
This brief explanation says it all:
Imagine that you cover / mask everything you don’t want to see with a kind of solid hatching. You can use the already drawn outlines of the butterflies for this.
