pureimage | puts the fun in functional raster image processing | Computer Vision library
kandi X-RAY | pureimage Summary
kandi X-RAY | pureimage Summary
PureImage is a raster image processing library written in Scala. See slides at [
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QUESTION
I'm new to node.js and this is just a small thing I need as part of a project that I'm writing in a different language.
How would I go about using pureimage to make a line from a start position to an end position and exporting it as a png? I'm interested in using pureimage because to my understanding you can set the line width with a variable
I currently have a working program with pngjs-draw but it's impossible to change line width there.
...ANSWER
Answered 2020-Aug-01 at 13:32You can specify the line thickness with the lineWidth property. Then you can draw your line in the canvas 2D context and export your image as a png file with pureimage, like this:
QUESTION
I am new to JavaScript/Node.js and image processing and would like to take the output of puppeteer screenshot (preferably in memory) then be able to traverse colors of each pixel in the image, then stroke a rectangle border around certain coordinated of the image (x, y, width, height), then write save the image with the rectangle highlights to file using Node.js.
What I get from puppeteer is
returns:
>
Promise which resolves to buffer or a base64 string (depending on the value of encoding) with captured screenshot.
I read that I can create a canvas object using puppeteer to do this but I am not sure about this solution especially to retrieve pixel colors. I don't know if I should be using a package like PureImage for this or some other package.
...ANSWER
Answered 2020-Feb-02 at 06:25If you need to draw, the easiest way would be using canvas. First, you need to create canvas from your image and then draw desired shape. After that convert your canvas back to img format.
This shows you how to create canvas from image:
QUESTION
I am trying to learn how to work with google functions and I want to be able to implement graphics in google functions. I want to be able to draw simple shapes like rectangle, ellipse and a line. Is it possible if so how? This is something I have tried and it is not working:
...ANSWER
Answered 2019-Nov-27 at 10:16I think that Cloud Functions are rather to compute some value, than to draw on front end. I'm not sure if its even possible (probably is, but will be difficult). In this situation I suppose you see 'false' at the end of the value shown in brawser as this is what you are adding at the end of response ( + TestDraw()
will return false
converted to string by +
operator)
QUESTION
I am doing a project for fun where I am drawing to a canvas in node using pureimage, and then writing each animation frame to a separate png file.
If I run the below code once, it works as expected and creates a single PNG file.
If I put it in a loop, the promise never finishes. I think the existing process is being stopped and restarted because if I stop the program the PNG is corrupt.
So my question is, how can I run multiple promises in a loop, and where can I learn more about this issue?
...ANSWER
Answered 2019-Sep-23 at 05:37When you are adding your code inside the loop, I think you were expecting it to work synchronously, right? But the thing is that promises are asynchronous in nature. The code inside the then
runs when the promise is resolved.
What you could do is use async/await feature, but you need to wrap it inside a function with an async
keyword before it like so:
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