All tools › Colours
Colouring page
A photograph as black lines on white to colour in, with the threshold in your hands because no single value suits both a face and a hedge.
It runs entirely in this browser tab: the file you open is never uploaded, and the result is re-encoded from pixels, so its metadata does not come with it.
Settings
- Line threshold
- How strong an edge has to be to become a line. Lower is more lines and more of them wrong. A number from 10 to 240.
- Line thickness
- A one-pixel line disappears on paper, so one step of thickening is what a printed page usually wants. A number from 0 to 3.
- Weighting
- The three published ones disagree, which is why this is a choice. Choices: Luminance, Television, Average of the three.
- The edges instead
- The grey edge image the drawing is made from, which is how you find the threshold you want.
- Save as
- Only PNG keeps transparency. JPEG fills it in. Choices: PNG, JPEG.
- Quality
- Below about seventy the blocking starts to show. A number from 1 to 100.
How to use it
- Paste your text into the box above, or open a file.
- Adjust the settings beside it until the result is what you wanted.
- Copy the result, or save it as a file. The result updates as you type.
Questions
- Is my picture uploaded anywhere?
- No. The whole application is carried as WebAssembly and runs on your own device. There is no server to send anything to, and none of these tools makes a network request while it works — not even the one that reads a photograph's location, which is why it gives coordinates rather than drawing a map.
- What happens to the EXIF data?
- It is gone. Every result here is written from pixels, so the camera, the date, the location and the copyright field are all dropped. That is the point of the location tool and a surprise to anybody who wanted the copyright kept, which is why every result says so.
- Is a blur enough to hide something?
- Usually not. A blur and a pixelation are averages of what was there, and both have been reversed in published work by blurring candidate images the same way and comparing. Only a solid fill or noise removes the information, and the tools say which method you chose.
- Why is the example a test pattern rather than a photograph?
- Because this workspace ships no image files anywhere, and a base64 photograph pasted into a source file would be one wearing a disguise. The patterns are drawn from nothing when the button is pressed.
Other tools for colours
Convert to grey
Five weightings, and a pure blue comes out anywhere from 18 to 85 depending which.
Invert the colours
The one operation here that is exactly reversible, and it leaves the alpha alone.
Make a colour transparent
Cuts a flat background out of a logo, with a soft edge so the outline is not jagged.
Dither to few colours
Error diffusion or an ordered matrix: one looks better, the other tiles and compresses.
Add grain
Film grain or sensor noise, and the one effect here that adds colours on purpose.
Glitch effect
Channels split and bands slid: a drawing of a fault, in a file that is not damaged.
All thirty-five tools