Legacy ImageMagick Discussions Archive

I applied img. image_type = Magick::TrueColorType . It works! Amazing!
Drarakel, thank you soo much for your help!
Anthony, thank you for your guidance!
Keep well, guys )

require 'rubygems'
require 'rmagick'

puts "processing file %s"%[file = ARGV.shift]
puts " and you've choosen %sto process ...

I supposed that singature is rather ImageMagick's term than Rmagik's. Here it is signature description from Rmagick docs.
img.signature -> string

Computes a message digest from an image pixel stream with an implementation of the NIST SHA-256 Message Digest algorithm. This signature uniquely ...

Yes I should had clearly stated in the beginning of my post that I used Rmagick 2.6.0 which is Ruby API to ImageMagick

I have a dozen B/W images that I consider symbols - they are figures 0..9, dot and comma.
And I need to process a lot of "raw images" consisted of those symbols. As you can see on ...

I made a mistake. The signature value depends on write/read only if I do image processing.
Here the test unit with sample image.

require 'rubygems'
require 'rmagick'

puts "processing file %s"%[file = ARGV.shift]
puts " and you've choosen %sto process thresholds"%[(process = /process/i =~ ARGV ...

The file format is TIFF

img.excerpt!(x, y, width, height)
puts img.inspect
img.write(f)
new_img = Magick::Image.read(f).first
puts new_img.inspect
img.signature != new_img.signature # why?

./samples/0211.tif TIFF 104x16=>4x10 4x10+0+0 DirectClass 8-bit 325b
tmp/0211.tif TIFF 4x10 4x10+0+0 ...

Hi,
How can I get the value of new_img.signature from img without saving/reading it ?