[Octave-bug-tracker] [bug #32986] imread() reads .png with alpha channel as an unexpected array format

[anonymous]

Follow-up Comment #2, bug #32986 (project octave):

I found another kind of strange inconsistent behavior, and have attached
'transparency_pic_gray2.png' to demonstrate this. 


img = imread('transparency_pic_gray2.png');

...produces an MxN array (alpha channel is silently dropped).




[img, map, alpha] = imread('transparency_pic_gray2.png');

...produces an error message:

error: imread: invalid image file: __magick_read__: unsupported indexed image
type
error: called from:
error:   C:Octave3.2.4_gcc-4.4.0shareoctave3.2.4mimageimread.m at line 74,
column 7


(file #23112)
    _______________________________________________________

Additional Item Attachment:

File name: transparency_pic_gray2.png     Size:1 KB


    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?32986>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.gnu.org/