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Hi,

It seems that free-image-ruby needs a FreeImage version > 3.10 since it works fine on my Debian testing development computer (with libfreeimage-dev-3.15.1-1) but fails on the Debian stable pre-production server with version 3.10.0-4.

(The error message reads Function 'FreeImage_HasPixels' not found in [/usr/lib64/libfreeimage.so].)

I really think a mention of the minimal FreeImage library version would be most helpful.

In cookbook, there's no example of how to do an image composite -- say for a watermark or something.

I've got code like:

wm = FreeImage::Bitmap.open(@watermark)
img = FreeImage::Bitmap.open(@file)
wm.composite(img)
wm.save(File.join(APP_ROOT, 'done.png'), :png)

but I get
FreeImage::Error: Cannot create a bitmap from a null pointer

Is composite working -- or does only composite_with_color work?

memory = FreeImage::Memory.new
image = FreeImage::Bitmap.open(...)
memory.save(image, :jpeg)

memory.memory.bytes
# => "\xFF\xD8\xFF\xE0"

memory.memory.count
# => 1017134

memory.memory.size
# => 9223372036854775807

This returns a memory object that contains 4 bytes, but has what appears to be the correct bytes count.

If I try image.save(memory, :jpeg) I get the same result.

white = FreeImage::RGBQuad.create(255, 255, 255)
white.to_s
=> "RGBQuad - Red: 0, Green: 0, Blue: 255, Alpha: 0"

I expected
=> "RGBQuad - Red: 255, Green: 255, Blue: 255, Alpha: 0"

free-image (0.6.2)

Could you please document (perhaps under AbstractSource::Encoder) the fact you can pass any value between 1 and 100 in the flags parameter when saving as JPEG to set a custom quality level. I only found this out from extensive googling on the FreeImage library.

image.save("./thumbnail.jpg", :jpeg, 90)

Cheers

I'm attempting to open an image from an IO stream (File object in this case), but I get the following error:

RangeError: integer 70353457099240 too big to convert to int' from /Users/tomwardrop/.rvm/gems/ruby-2.1.5/gems/free-image-0.6.2/lib/free-image/sources/io.rb:78:input_int32'

The cause is that a Ruby fixnum (which Ruby's Object#object_id returns) can be up to 62 bits, where as a C integer has a maximum length of 32 bits. I believe the following line needs to be changed to use a long instead of an int: https://github.com/cfis/free-image-ruby/blob/master/lib/free-image/sources/io.rb#L77