[squeak-dev] quick handling of graphics files
Ross Boylan
ross at biostat.ucsf.edu
Wed Apr 14 16:01:14 UTC 2010
On Wed, 2010-04-14 at 20:45 +0530, K. K. Subramaniam wrote:
> On Wednesday 14 April 2010 07:07:58 am Ross Boylan wrote:
> > One file took over a minute to open when I selected "open graphic in
> > window" from the file browser. (ImageReadWriter formFromFileNamed:
> > 'myfile.png') asMorph openInHand had about the same speed.
> That is way too long. I am able to open 300k+ scans of A4 sheets in a couple
> of seconds with Squeak 3.11 on Kubuntu 9.10.
>
> What is special about this file?
>
> Subbu
I don't know, but here's some more info:
$ identify -verbose UBH20100319.png
Image: UBH20100319.png
Format: PNG (Portable Network Graphics)
Class: PseudoClass
Geometry: 3360x4376+0+0
Type: Bilevel
Endianess: Undefined
Colorspace: Gray
Depth: 1-bit
Channel depth:
Gray: 1-bit
Channel statistics:
Gray:
Min: 0 (0)
Max: 1 (1)
Mean: 0.914863 (0.914863)
Standard deviation: 0.279085 (0.279085)
Histogram:
13451567: (255,255,255) #FFFFFF white
1251793: ( 0, 0, 0) #000000 black
Colormap: 2
0: ( 0, 0, 0) #000000 black
1: (255,255,255) #FFFFFF white
Rendering intent: Undefined
Resolution: 157.48x157.48
Units: PixelsPerCentimeter
Filesize: 141kb
Interlace: None
Background color: white
Border color: rgb(223,223,223)
Matte color: grey74
Transparent color: black
Page geometry: 3360x4376+0+0
Dispose: Undefined
Iterations: 0
Compression: Zip
Orientation: Undefined
Signature:
7aaf627fa1f5d1bae47c533ea395d610f975370e1c842764890d2c1115210f80
Tainted: False
User time: 0.550u
Elapsed time: 0:03
Pixels per second: 7.01111mb
Version: ImageMagick 6.3.7 08/07/09 Q16 http://www.imagemagick.org
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