Hello,
As mentioned in quite a few other posts, convert can be slow in converting
images between one format and another, depending on setup. I am experiencing
very slow processing. (Admittedly I'm working on an underpowered laptop,
which does not help).
Can I get some advice? I have about 1000 tiff images, of about 500KB each, so
not vast as far as tiffs are concerned. They are monochrome from microfilm. I
want to convert them to pngs suitable for website display - so resize and
then convert them.
Unfortunately the files were converted on some proprietary Windows based
scanning platform - opening them in the GIMP crashes KDE! However they are
not corrupted. I have put some version info at the end of this message. Note
the 'unknown field' report at the end, which every image has.
The advice I need is:
Will using Q8 rather than Q16 decrease the quality of the resulting image?
Would resizing first and then converting be better/quicker than doing in one
convert command?
If I want to use Q8, am I going to have to compile it?! Would I have to
unistall Q16 first? I'd rather apt-get, but I can't see it in my repos.
I guess I could try this in DOS, but I really don't want to!
Many thanks
RT
BASH# imageidentify -verbose Image\ 0106.tif
Image 0106.tif TIFF 8768x6528 DirectClass 377kb 2.120u 1:50
Image: Image 0106.tif
Format: TIFF (Tagged Image File Format)
Geometry: 8768x6528
Class: DirectClass
Type: Bilevel
Endianess: MSB
Colorspace: Gray
Channel depth:
Gray: 1-bits
Channel statistics:
Gray:
Min: 0 (0)
Max: 1 (1)
Mean: 0.703899 (0.703899)
Standard deviation: 0.456536 (0.456536)
Colors: 2
Histogram:
16948097: ( 0, 0, 0) black
40289407: (255,255,255) white
Rendering-intent: Undefined
Resolution: 300x300
Units: PixelsPerInch
Filesize: 377kb
Interlace: None
Background Color: white
Border Color: #DFDFDF
Matte Color: grey74
Dispose: Undefined
Iterations: 0
Compression: Group4
Orientation: LeftBottom
Make: Wicks and Wilson
Model: Wicks and Wilson Rollfilm Scanner
Signature: 6c1866aefbf7ea8a979de406e6659a540dc0df115167de95efb251274bdd1173
Software: Wicks and Wilson TIFF VER 1.0
Timestamp: 2007:03:05 09:31:06
Tainted: False
Version: ImageMagick 6.2.4 02/15/07 Q16 http://www.imagemagick.org
identify: Image 0106.tif: unknown field with tag 32961 (0x80c1) encountered.
`TIFFReadDirectory'.
conversion?
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