Skip to content

Instantly share code, notes, and snippets.

@sam

sam/Campbell.scala

Last active August 29, 2015 14:23
Show Gist options
  • Save sam/d2fe7b46c45322ef4838 to your computer and use it in GitHub Desktop.
Save sam/d2fe7b46c45322ef4838 to your computer and use it in GitHub Desktop.
Download ZIP
Chris Campbell's method of resizing an image while retaining quality (employed in ImgScalr).
Raw
Campbell.scala
def resize(current: Long, target: Long, iteration: Long = 1): Unit = {
val step = Math.max(current - (current / 7), target)
printf("[%04d] RESIZE FROM %d TO %d\n", iteration, current, step)
if(step > target)
resize(step, target, iteration + 1)
}
Raw
repl.session
scala> resize(5000,180)
[0001] RESIZE FROM 5000 TO 4286
[0002] RESIZE FROM 4286 TO 3674
[0003] RESIZE FROM 3674 TO 3150
[0004] RESIZE FROM 3150 TO 2700
[0005] RESIZE FROM 2700 TO 2315
[0006] RESIZE FROM 2315 TO 1985
[0007] RESIZE FROM 1985 TO 1702
[0008] RESIZE FROM 1702 TO 1459
[0009] RESIZE FROM 1459 TO 1251
[0010] RESIZE FROM 1251 TO 1073
[0011] RESIZE FROM 1073 TO 920
[0012] RESIZE FROM 920 TO 789
[0013] RESIZE FROM 789 TO 677
[0014] RESIZE FROM 677 TO 581
[0015] RESIZE FROM 581 TO 498
[0016] RESIZE FROM 498 TO 427
[0017] RESIZE FROM 427 TO 366
[0018] RESIZE FROM 366 TO 314
[0019] RESIZE FROM 314 TO 270
[0020] RESIZE FROM 270 TO 232
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment