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Asked: 2026-06-14T16:56:45+00:00

I am creating an image viewer application using HTML5 canvas. I have used two

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I am creating an image viewer application using HTML5 canvas. I have used two canvas, first one used for loading the image in the actual width and height which not shown to the user ( It is a hidden canvas not appended into DOM tree),the second one which is actually presenting to the user.Suppose the actual resolution of the image is 1200*800. I loaded the image into the hidden canvas of size 1200*800.Then I tried to load the image into the visible canvas of resolution 700*600(I added the code like ctx.drawImage(hiddenCanvas,0,0,700,600).I could see the entire image in this resolution. I have the below questions.

  1. Will it keep aspect ratio when loading into the visible canvas? Or Have we do aspect ratio manipulation manually.
  2. Will it lose the quality of image when doing like so. Is this a standard method for doing an imageviewer application?

I have to add Zoom In,Zoom Out,Pan like features into this viewer.

Please any one can answer my questions.

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1 Answer

  1. Editorial Team

    When you say ,0,0,700,600, you’re automatically specifying the aspect ratio.

    Most resizing operations will degrade image quality. If you resize a 1200×800 image to 700×600, there will be some sort of interpolation (linear, bicubic etc) that will be performed.

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