'Line Type' with the least noise is 'Fine Pen' mode. If the original image is a JPEG, it's better to be uncompressed, and the resolution shoudn't be too low.

It's better to use an image with less noise to get better output. If you set the background to transparent, you can add a layer under the output image and color the lower layer, so that the extracted lines will not be hidden in the fill. If you are to color it digitally, a transparent background is more useful. If you are to color in analog, it is recommended to use a white background. This option is also useful to use as a coloring book with hints on where to paint in what color if you want to repaint with the same color as the original image. It's good for painting watercolor with a soft touch, and it's suitable for converting face photos without losing their original atmosphere, or converting food photos without losing their delicious look. If you want to make the contour lines less noticeable when applying color, this mode is the best. The colors used in the original image will be extracted as outlines. This option is recommended for technical drawing such as drafting of buildings or machinery.Īlso, if you convert with 'Fine Pen' and the lines are whited out or blacked out, try again with 'Pencil' and it may work. Since the position of the lines are clear, it's suitable for tracing lines by yourself over the output image. Not all printers are supported, so this is a setting for advanced users. However, the vector format cannot be saved on iPhone or iPad. So it is recommended for larger image or printing.

The difference in this vector format is that the output is not blocky(pixelated) no matter how much you zoom in. It looks almost the same as the regular 'Smooth Pen'. 'Smooth Pen' style can be output in vector format (SVG file). It's recommended that the original image is 1280px or larger and is not too compressed.

On the other hand, it's not good for converting illustrations which requires delicate touch, noisy photos, low resolution images, and portrait photographs. This option is suitable for converting images with clear outlines, such as manga and anime, or flat color illustrations. Since the lines are clear, anti-aliased and have no shading, the output is close to coloring page, and it's especially suitable for printing. Like a fountain pen, the lines are pressure sensitive. It's like a G-pen (thick dipping pen) for drawing illustrations. This can extract lines accurately and is suitable for fine touch drawing.īecause of its wide range of usages and short processing time, it is recommended to choose this option basically. It's like a mapping pen (fine dipping pen) for drawing illustrations.

Black and white image with color lines