1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
#!/usr/bin/ruby
require "vips"
# this makes vips keep a list of all active objects
# Vips::leak_set true
# disable the operation cache
# Vips::cache_set_max 0
# turn on debug logging
# Vips.set_debug true
if ARGV.length < 2
raise "usage: #{$PROGRAM_NAME}: input-file output-file"
end
im = Vips::Image.new_from_file ARGV[0], access: :sequential
im *= [1, 2, 1]
# we want to be able to specify a scale for the convolution mask, so we have to
# make it ourselves
# if you are OK with scale=1, you can just pass the array directly to .conv()
mask = Vips::Image.new_from_array [[-1, -1, -1],
[-1, 16, -1],
[-1, -1, -1]], 8
im = im.conv mask
im.write_to_file ARGV[1]
|
