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Documentation Index

Fetch the complete documentation index at: https://mintlify.com/ragaeeb/kokokor/llms.txt

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Function Signature

calculateDPI(imageSize: Size, pdfSize: Size): { x: number; y: number }

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Parameters

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imageSize
Size
required
Dimensions of the rasterized image in pixels
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width
number
required
Width in pixels
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height
number
required
Height in pixels
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pdfSize
Size
required
Original dimensions of the PDF page in points (1/72 inch)
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width
number
required
Width in points
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height
number
required
Height in points

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Returns

Object containing x and y DPI values
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x
number
Horizontal DPI (dots per inch)
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y
number
Vertical DPI (dots per inch)

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Description

Calculates the DPI (dots per inch) based on image dimensions and original PDF size. This utility function helps determine the resolution at which a PDF was rasterized by comparing the resulting image dimensions with the original PDF page dimensions. The DPI values are essential for proper scaling of pixel-based tolerances and measurements throughout the document processing pipeline.

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Usage Example

import { calculateDPI } from 'kokokor';

// A4 page dimensions
const imageSize = { width: 2480, height: 3508 };
const pdfSize = { width: 595, height: 842 }; // A4 page in points

const dpi = calculateDPI(imageSize, pdfSize);
console.log(`DPI: ${dpi.x} x ${dpi.y}`);
// Result: DPI: 300 x 300 for a 300 DPI scan

// Use DPI for scaling tolerances
const pixelTolerance = 5;
const scaledTolerance = pixelTolerance * (dpi.x / 72);