Convert Pixels to Points

Convert Pixels to Points

There are 72 points per inch; if it is sufficient to assume 96 pixels per inch, the formula is rather simple:

points = pixels * 72 / 96

There is a way to get the configured pixels per inch of your display in Windows using GetDeviceCaps. Microsoft has a guide called "Developing DPI-Aware Applications", look for the section "Creating DPI-Aware Fonts".

The W3C has defined the pixel measurement px as exactly 1/96th of 1in regardless of the actual resolution of your display, so the above formula should be good for all web work.

Convert pixels to points for pdf

If you want to fit 400 pixels in 300 points, then your resizing factor would simply be 300 / 400 = 0.75. You need to put each pixel in 0.75 of a point.

But there is another story you should know: Each point is 1/72 of an inch. and how many pixels make 1 inch is a matter of choice.

All images have a property called DPI: dots per inch. It specifies how many pixels are there for each inch of the picture. So if you want to convert a 400px * 400px picture to a (say) 96 dpi image, your resizing factor will be 400 / ((72 / 96) * 400). 72 here is for converting inches to points.

How do I figure out pixel to point conversion on specific iPhone?

The direct answer to your question is to use the scale property of UIScreen.

But you probably don't need that depending on how your image is created. Given your tags, it is likely you are using UIGraphicsBeginImageContextWithOptions. Note its third parameter of scale. If you pass 0 you get the device's scale. But in your case you want a scale of 1.

Raster to Point conversion: how to convert every single pixel? on Google Earth Engine

ee.Image.sample returns a point for every pixel.

var vectors = image.sample({
  region: treat,
  geometries: true,  // if you want points
});

If you do not specify a scale and crs, it will use each pixel in the input image's original resolution. If you do, it will sample at the given scale instead.

Demonstration script:

var region = ee.Geometry.Polygon(
  [[[-110.00683426856995, 40.00274575078824],
    [-110.00683426856995, 39.99948706365032],
    [-109.99576210975647, 39.99948706365032],
    [-109.99576210975647, 40.00274575078824]]], null, false);
var image = ee.Image('CGIAR/SRTM90_V4');
Map.setCenter(-110, 40, 16);
Map.addLayer(image, {min: 1000, max: 2000}, 'SRTM');

var vectors = image.sample({
  region: region,
  geometries: true,
});
print(vectors);
Map.addLayer(ee.FeatureCollection([region]).style({"color": "white"}));
Map.addLayer(vectors);

https://code.earthengine.google.com/625a710d6d315bad1c2438c73bde843b

PSD pixels to ios points

Converting pixels to points depends on the target iOS device. On a 1x device (iPad 1 & 2, iPhone up to 3GS), 1 UIKit point == 1 pixel. On Retina devices (iPad 3 and up, iPhone 4 and up), 1 UIKit point == 2 pixels.

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