From: "C. Dagnon" <c-soc-rubyforum@...>
Date: 2009-05-18T08:21:57+09:00
Subject: TkPhotoImage.copy always gives "too many colors" Error

I'm working to copy and eventually manipulate images within Ruby, but
the Tk extension seems to be broken.  My program (minus some crud) looks
like this:

require 'tk'
require 'tk/image'
require 'tkextlib/tkimg'

# Settings
image_file_suffix = '.jpg'
final_filename = "final.jpg"

# Find all the separate images
Dir.chdir( to_dir )

image_filenames = []
regex = Regexp.compile("^[0-9]+.*\\#{image_file_suffix}$")
Dir.foreach(".") {|filename|  image_filenames << filename if filename =~
regex }

photos = []
pixel_height = 0
pixel_width = 0
image_filenames.each{ |image_fn|
  image = TkPhotoImage.new( :file => image_fn )
  photos << image
  pixel_width += photo.width
  pixel_height = photo.height > pixel_height ? photo.height :
pixel_height
}

compound_image = TkPhotoImage.new( :height => pixel_height, :width =>
pixel_width )
compound_image.blank

curr_x = 0
photo = photos[0]
# All give C:/ruby/ruby1_86_26/lib/ruby/1.8/tk.rb:2272:in `__invoke':
too many colors (RuntimeError)
#compound_image.copy( photo, :from => [0,0,photo.width, photo.height] )
#data = photo.data( :from => [0,0,photo.width, photo.height] )
#compound_image.copy( photo )
compound_image.put( photo.data )

compound_image.write final_filename
----------------------------

So I've tried the 4 different commands near the end and everything
fails.  In particular I added a puts at the tk.rb method mentioned and
get the following out using any .copy() call:

INVOKE: ["i00002", "copy", "i00000"]
INVOKE: ["i00002", "write", "final.jpg"]
INVOKE: ["rename", "INTERP_FINALIZE_HOOK", ""]

And it is always after the last one when the error gets thrown.  The
.put(.data()) call dumps all the data to the console (and takes a looong
time), but otherwise the last 2 commands and the error are always the
same.  The file actually created is only 6 bytes - not a good result
when trying to copy a 35K file over...  I've tried it as a simple way to
copy a couple different images with the same results.  Google only finds
me many versions of a code file with INTERP_FINALIZE_HOOK in it -
nothing useful nor explanatory except possibly a couple links at the
very end in Japanese.


Any ideas appreciated!

-Chris
WinXP SP3?, Ruby 1.8.6, ActiveTcl 8.4.17.0...
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