12-04-2017, 09:00 PM
@TechnicGeek
That is interesting. Taking the pixels-per-inch (ppi = dpi) first. This is important for printing. Photographs on photo paper, usually 300 ppi is used. For printing on fabric, I think a smaller value could be used maybe 150 to 200 ppi.
The photo you get out of your digital camera is probably a jpeg image. The main property is the image size in pixels. Open the image in Gimp and that size is top of the Gimp window. Look in the menu Image > Print size and there will be a ppi value. You check that, but the main one is pixel size. Gimp works in pixels.
The main reason for converting to a vector image is for scaling. A vector image can be scaled up or down without loss of quality. Especially useful for small simple images with few colours where scaling up in Gimp results in loss of definition/quality.
Not so useful if the image is already a large size and is more complicated.
Converting to a vector will usually reduce the number of colours and simplify shapes, That might be a good thing for printing on fabric.
As an example going through the stages
This using the gmic plug-in I mentioned earlier to remove the background: https://i.imgur.com/iTQ7apU.jpg
Exported from Gimp as a png then into Inkscape to trace. Note that the number of scans is 10, so I will get 10 colours. https://i.imgur.com/Ei4TU6K.jpg
Now if I save that as a vector svg file, I can open-as-layers in Gimp set the values to match the canvas I made for it and set the size to whatever is required: https://i.imgur.com/SZYR8VQ.jpg
That is interesting. Taking the pixels-per-inch (ppi = dpi) first. This is important for printing. Photographs on photo paper, usually 300 ppi is used. For printing on fabric, I think a smaller value could be used maybe 150 to 200 ppi.
The photo you get out of your digital camera is probably a jpeg image. The main property is the image size in pixels. Open the image in Gimp and that size is top of the Gimp window. Look in the menu Image > Print size and there will be a ppi value. You check that, but the main one is pixel size. Gimp works in pixels.
The main reason for converting to a vector image is for scaling. A vector image can be scaled up or down without loss of quality. Especially useful for small simple images with few colours where scaling up in Gimp results in loss of definition/quality.
Not so useful if the image is already a large size and is more complicated.
Converting to a vector will usually reduce the number of colours and simplify shapes, That might be a good thing for printing on fabric.
As an example going through the stages
This using the gmic plug-in I mentioned earlier to remove the background: https://i.imgur.com/iTQ7apU.jpg
Exported from Gimp as a png then into Inkscape to trace. Note that the number of scans is 10, so I will get 10 colours. https://i.imgur.com/Ei4TU6K.jpg
Now if I save that as a vector svg file, I can open-as-layers in Gimp set the values to match the canvas I made for it and set the size to whatever is required: https://i.imgur.com/SZYR8VQ.jpg