i am trying to image trace an image of my fingerprint, the print is dicey , but is there a way to have the image trace be solid black lines without all the white spots ? using one of the filters ?
You can trace directly in Inkscape, however to get a good result I would clean up the image in an bitmap graphics program first such as GIMP ( which I used and is free ) or photoshop.
Inkscape and GIMP are commonly used together. The tool you want in GIMP is called 'Select by Colour Tool', and I would adjust the threshold slider for the tool - futher down the page - to be closer to zero.
Then start selecting the colours you don't want such as white, delete, and move onto the next darkest shade of grey to white.
The image needs to have an alpha channel if you want a transparent png to export ( right click the layer and choose 'add alpha channel')
I also like to add a black layer and a white layer, that way you can alternate the background between black and white to see any rogue spots you have missed around the edges of the page.
I used the eraser tool to get rid of them.
Then when you are happy, select all, and use the colour>threshold tool and move the middle slider to the right to make everything black.
Hide the black and white background layers, and export to png.
Import to Inkscape and Object>Bitmap trace use 'Brightness Cutoff'
The original image you made, is a bit smudgy in the middle, you can either make it again, or spend more time in GIMP manually correcting it to get a better result.
Notice how the SVG is a lot bigger than the PNG, due to the number of points in the trace.
You can try to reduce this size by simplifying the image, Ctrl+A to select all then tap Ctrl+L to simplify, you have have to wait a minute if you pc is not very fast.
If you are going to export to PNG from Inkscape anyway ( transparent background ) it doesn't really matter.
Also just to let you know jpeg images from the iphone 7 contain GPS coordinates unless you disable or remove them.
There are free programs to remove that data without affecting the image quality. XnViewMP (free) has a menu Tools>Metadata>Clean which will do this for you.
Beginners' Questions help with image trace
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i am trying to image trace an image of my fingerprint, the print is dicey , but is there a way to have the image trace be solid black lines without all the white spots ? using one of the filters ?
thanks for any help ,
michael
You can trace directly in Inkscape, however to get a good result I would clean up the image in an bitmap graphics program first such as GIMP ( which I used and is free ) or photoshop.
Inkscape and GIMP are commonly used together. The tool you want in GIMP is called 'Select by Colour Tool', and I would adjust the threshold slider for the tool - futher down the page - to be closer to zero.
Then start selecting the colours you don't want such as white, delete, and move onto the next darkest shade of grey to white.
The image needs to have an alpha channel if you want a transparent png to export ( right click the layer and choose 'add alpha channel')
I also like to add a black layer and a white layer, that way you can alternate the background between black and white to see any rogue spots you have missed around the edges of the page.
I used the eraser tool to get rid of them.
Then when you are happy, select all, and use the colour>threshold tool and move the middle slider to the right to make everything black.
Hide the black and white background layers, and export to png.
Import to Inkscape and Object>Bitmap trace use 'Brightness Cutoff'
Delete the orginal image :)
I've attached the png and the svg I made.
The original image you made, is a bit smudgy in the middle, you can either make it again, or spend more time in GIMP manually correcting it to get a better result.
Notice how the SVG is a lot bigger than the PNG, due to the number of points in the trace.
You can try to reduce this size by simplifying the image, Ctrl+A to select all then tap Ctrl+L to simplify, you have have to wait a minute if you pc is not very fast.
If you are going to export to PNG from Inkscape anyway ( transparent background ) it doesn't really matter.
Also just to let you know jpeg images from the iphone 7 contain GPS coordinates unless you disable or remove them.
There are free programs to remove that data without affecting the image quality. XnViewMP (free) has a menu Tools>Metadata>Clean which will do this for you.
GIMP and XnViewMP both run on Linux/Windows/Mac