Try adding text to an image in Scala using the Java standard library


When trying to add text to an image in Scala, I think the easiest way to implement it is to use the Java standard library. So, basically, the implementation content is almost the same as Java, but I will introduce the sample code together with the referenced site.


There are a few, but I will list the articles that I referred to.

-Scala Documentation --Image processing: Scala image reading / output documentation. -Read a JPEG file with Java, write figures and characters, and output: An implementation that adds characters to images is introduced. I will. -[Java] Image Editing-Combine images vertically and horizontally-: An implementation that combines images with images is introduced. .. -Draw a character string in the [Java] window: The implementation related to font setting is introduced. -Fill background: An implementation that fills the background is introduced. -[Java] Use of anti-aliasing: The implementation of anti-aliasing for characters is introduced. -Change the save quality of JPEG images in Java: The implementation to set the save quality of images is introduced.

Sample code

This is a sample code that adds characters to the side of the original image and outputs it. While saying Scala, I think it's almost the same as Java.


import java.awt.{Color, Font, RenderingHints}
import java.awt.image.BufferedImage
import{File, FileOutputStream}

import javax.imageio.{IIOImage, ImageIO, ImageWriteParam}

object ImageWritingWordSample extends App {
  //Loading the original image
  val originalImage = File(s"resources/200x50.png "))

  //Incorporate the original image into the new image
  val newImage = new BufferedImage(320, 50, originalImage.getType)
  val graphics = newImage.createGraphics()
  graphics.drawImage(originalImage, 0, 0, null)

  //Background color where you write letters
  graphics.fillRect(200, 0, 320, 50)

  //Font settings
  graphics.setFont(new Font("Arial", Font.PLAIN, 12))
  //Letter color
  graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON)
  //Add characters
  graphics.drawString("Test test", 210,20)
  graphics.drawString("Test test", 210,40)

  //Image output
  val os = new FileOutputStream("resources/new_320x50.jpeg ")
  val ios = ImageIO.createImageOutputStream(os)
  val writer = ImageIO.getImageWritersByFormatName("jpeg").next
  val param = writer.getDefaultWriteParam
  //Image quality settings
  writer.write(null, new IIOImage(newImage, null, null), param)

Execution result

【The original image】 200x50.png ** [Image after adding characters] ** new_320x50.jpeg

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