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How to resize of my output image after converting svg to image?

By : Alex
Date : August 02 2020, 08:00 AM
wish of those help your output image is 1/4 of main source, because your canvas size not matching your source svg size.
you can set canvas width and height to convert whole svg into png
code :
var canvas = document.getElementById('canvas');
canvas.height = 300;
canvas.width = 400;
var btn = document.querySelector('button');
var svg = document.getElementById('svg');
var canvas = document.querySelector('canvas');

function triggerDownload (imgURI) {
  var evt = new MouseEvent('click', {
    view: window,
    bubbles: false,
    cancelable: true

  var a = document.createElement('a');
  a.setAttribute('download', 'image.png');
  a.setAttribute('href', imgURI);
  a.setAttribute('target', '_blank');


btn.addEventListener('click', function () {
  var canvas = document.getElementById('canvas');
  canvas.height = 300;
  canvas.width = 400;
  var ctx = canvas.getContext('2d');
  var data = (new XMLSerializer()).serializeToString(svg);
  var DOMURL = window.URL || window.webkitURL || window;

  var img = new Image();
  var svgBlob = new Blob([data], {type: 'image/svg+xml;charset=utf-8'});
  var url = DOMURL.createObjectURL(svgBlob);

  img.onload = function () {
    ctx.drawImage(img, 0, 0);

    var imgURI = canvas
        .replace('image/png', 'image/octet-stream');


  img.src = url;
<button>svg to png</button>
    <select class="color" id="color">  
                  <option value="" >Select Color</option>
                  <option value="black" >Black</option> 
                  <option value="red" >Red</option> 
                  <option value="blue" >Blue</option>
    <svg id="svg" class="teeth" 
     width="400px" height="300px" viewBox="0 0 400 300" preserveAspectRatio="xMidYMid meet">
        <!-- upper right 8 -->
        <g id="molar-group" class="molar">
            <rect x="75" y="75" stroke="black" id="disto-occlusal" style="stroke-width: 5px;" width="125" height="150" fill="white"/>
            <rect x="200" y="75" stroke="black" id="mesio-occlusal" style="stroke-width: 5px;" width="125" height="150" fill="white"/>

            <polygon stroke="black" id="disto-buccal" style="stroke-width: 5px;" points="0 0 200 0 200 75 75 75" fill="white" />
            <polygon stroke="black" id="mesio-buccal" style="stroke-width: 5px;" points="200 0 400 0 325 75 200 75" fill="white" />

            <polygon stroke="black" id="mesial" style="stroke-width: 5px;" points="400 0 400 300 325 225 325 75" fill="white" />

            <polygon stroke="black" id="mesio-palatal" style="stroke-width: 5px;" points="400 300 200 300 200 225 325 225" fill="white" />
            <polygon stroke="black" id="disto-palatal" style="stroke-width: 5px;" points="200 300 0 300 75 225 200 225" fill="white" />

            <polygon stroke="black" id="distal" style="stroke-width: 5px;" points="0 300 0 0 75 75 75 225" fill="white" />
<canvas id="canvas" name="canvas"></canvas>

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Resize preview image based on original image output percentage

By : Arienrhod
Date : March 29 2020, 07:55 AM
I wish this help you for the help! After searching for days, I found out that it wasn't a wrong outputPct. The problem was the DPI. Previews are always generated at 96dpi and originals can be any dpi. When calculating the scale I needed to make sure that I multiplied the outputPct with the dpiRatio.

Why does my image resize code always product a completely black output image?

By : Rik Sprint
Date : March 29 2020, 07:55 AM
it helps some times I'm trying to resize an image. I thought it was a simple task... , You need to get the graphics from the OutputImage.
code :
public static Bitmap Scale(this Bitmap inputImage, Size newSize)
    var outputImage = new Bitmap(newSize.Width, newSize.Height);

    using (Graphics gr = Graphics.FromImage(outputImage))
        gr.SmoothingMode = SmoothingMode.HighQuality;
        gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
        gr.PixelOffsetMode = PixelOffsetMode.HighQuality;
        gr.DrawImage(inputImage, new Rectangle(0, 0, newSize.Width, newSize.Height));

    return outputImage;

My output is a black image when converting RGB image to greyscale

By : user3386973
Date : March 29 2020, 07:55 AM
I hope this helps . You forgot to multiply the size of the RGB matrix by 3.
It should be: cudaMalloc((float**) &d_imgIn, size*3); and cudaMemcpy(d_imgIn, imgIn, size*3, cudaMemcpyHostToDevice);.
code :
int main()
    //int nCols = 512;int nRows = 384;int channels = 3;
    float *imgIn, *imgOut;
    int nCols, nRows, channels;

    // Allocate images and initialize from file
    imgIn = read_colored_image_asfloat(argv[1],&nCols, &nRows, &channels);

    //imgIn = (float*)calloc(nCols*nRows*3, sizeof(float));
    //FILE *f = NULL;fopen_s(&f, "rgb32f.raw", "rb");fread(imgIn, sizeof(float), nCols*nRows*3, f);fclose(f);f = NULL;

    imgOut = (float*)calloc(nCols*nRows, sizeof(float));

    // Allocates device images
    float *d_imgIn, *d_imgOut;
    //@TODO@ : Complete for device allocations
    int size = (nCols*nRows)*sizeof(float);
    // allocate memory on device
    cudaMalloc((float**)&d_imgIn, size*3);
    cudaMalloc((float**)&d_imgOut, size);

    // Copy input data
    //@TODO@ : Complete for data copy
    cudaMemcpy(d_imgIn, imgIn, size*3, cudaMemcpyHostToDevice);
    // Call the kernel
    //@TODO@ : Compute threads block and grid dimensions
    dim3 GridDim((nCols/16)+1, (nRows/16)+1, 1);
    dim3 BlockDim(16, 16, 1);
    //@TODO@ : Call the CUDA kernel
    colorConvert<<<GridDim, BlockDim>>>(d_imgOut, d_imgIn, nCols, nRows);
    // Copy output data
    //@TODO@ : Complete for data copy
    cudaMemcpy(imgOut, d_imgOut, size, cudaMemcpyDeviceToHost);

    //fopen_s(&f, "gray32f.raw", "wb");fwrite(imgOut, sizeof(float), nCols*nRows, f);fclose(f);f = NULL;
    // Write gray image to file
    write_gray_image_fromfloat(argv[2], imgOut, nCols, nRows, 1);

    // Free memory
    //@TODO@ : Free host and device memory
    // free host

    // free device

    return 0;
cudaError_t err = cudaMemcpy(imgOut, d_imgOut, size, cudaMemcpyDeviceToHost);

Resize image java with Scalr, Incorrect output image, grey

By : yann-sun
Date : March 29 2020, 07:55 AM
I wish this help you You'd need to "load" the image first, take a look at ImageIO API for more details, after that, depending on your needs, it's relatively simple to scale the image

Python Magickwand pdf to image converting and resize the image

By : Urban Mrak
Date : March 29 2020, 07:55 AM
hope this fix your issue I found work around for this problem. Convert pdf into image 1st and save the image. open newly saved image and and resize it.
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