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convert grayscale tif to psd, create very large psd-file
Posted: 2017-10-16T01:38:49-07:00
by mop
Hi
When I convert a grayscale tif (806 K) it result in a very large psd (57 M) - 72 times bigger than the original tif.
Is this expected?
The input tif-file in this test can be found at
https://www.dropbox.com/s/343gugdo9rn9y ... e.tif?dl=0
The result is at:
https://www.dropbox.com/s/lrjg6rehh65p4 ... e.psd?dl=0
I use the command:
convert 072017McCain_grayscale.tif grayscale.psd
This is done with ImageMagick version 7.0.7-7 on Linux (redhat 7).
regards
Morten
Re: convert grayscale tif to psd, create very large psd-file
Posted: 2017-10-16T09:47:27-07:00
by fmw42
Add -compress lzw. Your input has lzw compression.
Code: Select all
convert 072017McCain_grayscale.tif -compress lzw 072017McCain_grayscale_new.tif
identify 072017McCain_grayscale.tif 072017McCain_grayscale_new.tif
072017McCain_grayscale.tif TIFF 6375x4712 6375x4712+0+0 8-bit Grayscale Gray
825332B 0.010u 0:00.009
072017McCain_grayscale_new.tif TIFF 6375x4712 6375x4712+0+0 8-bit Grayscale Gray
801852B 0.000u 0:00.000
Re: convert grayscale tif to psd, create very large psd-file
Posted: 2017-10-16T22:43:06-07:00
by mop
Thanks for your reply
But I need to convert the tif-file to a PSD-file.
And convert create a valid PSD-file, but the size is increased by a factor 72.
If I open the tif in Photoshop and save it as a PSD, the size increase by a factor 2 (1.7M).
I can not see, what the remaining 56M data contain.
regards
Morten
Re: convert grayscale tif to psd, create very large psd-file
Posted: 2017-10-16T23:12:04-07:00
by fmw42
There are several issue with converting your lzw compressed grayscale 1-bit TIFF to PSD.
PSD will be uncompressed. I tried using lzw compression, but that did not work.
PSD will include an alpha channel. I tried removing he alpha channel but that did not work.
PSD has two layers -- the same image, but one is the flattened layer and the other is the original image. Flattening does nothing. So you really have two equal layers.
All these factors increase the size of TIFF to PSD .
Code: Select all
convert -quiet 072017McCain_grayscale.tif -alpha off -compress lzw -type bilevel -depth 1 test.psd
identify test.psd
test.psd[0] PSD 6375x4712 6375x4712+0+0 1-bit Grayscale Gray 256c 7.17843MiB 0.010u 0:00.009
test.psd[1] PSD 6375x4712 6375x4712+0+0 1-bit Gray 256c 7.17843MiB 0.000u 0:00.000
Code: Select all
Image: test.psd
Image: test.psd
Format: PSD (Adobe Photoshop bitmap)
Class: DirectClass
Geometry: 6375x4712+0+0
Resolution: 750x750
Print size: 8.5x6.28267
Units: PixelsPerInch
Type: PaletteAlpha
Endianess: MSB
Colorspace: sRGB
Depth: 1-bit
Channel depth:
red: 1-bit
green: 1-bit
blue: 1-bit
alpha: 1-bit
Channel statistics:
Pixels: 30039000
Red:
min: 0 (0)
max: 1 (1)
mean: 0.751825 (0.751825)
standard deviation: 0.431954 (0.431954)
kurtosis: -0.640485
skewness: -1.16598
entropy: 0.808372
Green:
min: 1 (1)
max: 1 (1)
mean: 1 (1)
standard deviation: nan (nan)
kurtosis: 1.79958e+69
skewness: 4.57541e+49
entropy: nan
Blue:
min: 1 (1)
max: 1 (1)
mean: 1 (1)
standard deviation: nan (nan)
kurtosis: 1.79958e+69
skewness: 4.57541e+49
entropy: nan
Alpha:
min: 1 (1)
max: 1 (1)
mean: 1 (1)
standard deviation: 0 (0)
kurtosis: -3
skewness: 0
entropy: nan
Image statistics:
Overall:
min: 1 (1)
max: 0 (0)
mean: 0.312044 (0.312044)
standard deviation: 0.463328 (0.463328)
kurtosis: -1.34174
skewness: -0.811332
entropy: nan
Colors: 2
Histogram:
7454921: ( 0,255,255,255) #00FFFFFF cyan
22584079: (255,255,255,255) #FFFFFFFF white
Rendering intent: Perceptual
Gamma: 0.454545
Chromaticity:
red primary: (0.64,0.33)
green primary: (0.3,0.6)
blue primary: (0.15,0.06)
white point: (0.3127,0.329)
Background color: srgba(255,255,255,0)
Border color: srgba(223,223,223,1)
Matte color: grey74
Transparent color: none
Interlace: None
Intensity: Undefined
Compose: Over
Page geometry: 6375x4712+0+0
Dispose: Undefined
Iterations: 0
Scene: 0 of 2
Compression: None
Orientation: Undefined
Properties:
date:create: 2017-10-16T23:26:40-07:00
date:modify: 2017-10-16T23:26:40-07:00
icc:copyright: Copyright 1999 Adobe Systems Incorporated
icc:description: Dot Gain 20%
icc:manufacturer: Dot Gain 20%
icc:model: Dot Gain 20%
signature: fcfeea68d8bb147fd69eac37a7aaedef8dfb5fc75405bcb4c005060f3c532c5e
tiff:XResolution: 750
tiff:YResolution: 750
Profiles:
Profile-8bim: 16096 bytes
Profile-icc: 912 bytes
Artifacts:
filename: test.psd
verbose: true
Tainted: False
Filesize: 0B
Number pixels: 30039000
Pixels per second: 19762500B
User time: 5.200u
Elapsed time: 0:02.519
Version: ImageMagick 6.9.9-20 Q16 x86_64 2017-10-16 http://www.imagemagick.org
Image: test.psd
Format: PSD (Adobe Photoshop bitmap)
Class: DirectClass
Geometry: 6375x4712+0+0
Resolution: 750x750
Print size: 8.5x6.28267
Units: PixelsPerInch
Type: PaletteAlpha
Endianess: MSB
Colorspace: Gray
Depth: 1-bit
Channel depth:
gray: 1-bit
alpha: 1-bit
Channel statistics:
Pixels: 30039000
Gray:
min: 0 (0)
max: 1 (1)
mean: 0.751825 (0.751825)
standard deviation: 0.431954 (0.431954)
kurtosis: -0.640485
skewness: -1.16598
entropy: 0.808372
Alpha:
min: 1 (1)
max: 1 (1)
mean: 1 (1)
standard deviation: 0 (0)
kurtosis: -3
skewness: 0
entropy: nan
Colors: 2
Histogram:
7454921: ( 0,255,255,255) #00FFFFFF graya(0,1)
22584079: (255,255,255,255) #FFFFFFFF graya(255,1)
Rendering intent: Undefined
Gamma: 0.454545
Background color: graya(255,1)
Border color: graya(223,1)
Matte color: graya(189,1)
Transparent color: graya(0,0)
Interlace: None
Intensity: Undefined
Compose: Over
Page geometry: 6375x4712+0+0
Dispose: Undefined
Iterations: 0
Scene: 1 of 2
Compression: None
Orientation: Undefined
Properties:
date:create: 2017-10-16T23:25:06-07:00
date:modify: 2017-10-16T23:25:06-07:00
icc:copyright: Copyright 1999 Adobe Systems Incorporated
icc:description: Dot Gain 20%
icc:manufacturer: Dot Gain 20%
icc:model: Dot Gain 20%
label: L1
signature: fcfeea68d8bb147fd69eac37a7aaedef8dfb5fc75405bcb4c005060f3c532c5e
tiff:XResolution: 750
tiff:YResolution: 750
Profiles:
Profile-8bim: 16096 bytes
Profile-icc: 912 bytes
Artifacts:
filename: test.psd
psd:layer.opacity: 65535
psd:layer.x: 0
psd:layer.y: 0
verbose: true
Tainted: False
Filesize: 7.17843MiB
Number pixels: 30039000
Pixels per second: 2.34863MB
User time: 18.500u
Elapsed time: 0:13.789
Version: ImageMagick 6.9.9-20 Q16 x86_64 2017-10-16 http://www.imagemagick.org
I am sorry, I do not know what more to try. Or if this is just the way PSD files are formed.
Re: convert grayscale tif to psd, create very large psd-file
Posted: 2017-10-17T08:39:13-07:00
by snibgo
The input image as 30 million pixels. At one byte per pixel, two images per PSD, with no compression, this takes 60 MB.
For IM v6.9.5-3, an experiment shows that the only helpful compression method is RLE. The code in psd.c shows RLE as the only compression method implemented.
Re: convert grayscale tif to psd, create very large psd-file
Posted: 2017-10-17T09:09:38-07:00
by fmw42
Using RLE compression as snibgo suggested, I now get
Code: Select all
convert -quiet 072017McCain_grayscale.tif -alpha off -compress rle -type bilevel -depth 1 test.psd
identify test.psd
test.psd[0] PSD 6375x4712 6375x4712+0+0 1-bit Grayscale Gray 256c 2.476MiB 0.010u 0:00.009
test.psd[1] PSD 6375x4712 6375x4712+0+0 1-bit Gray 256c 2.476MiB 0.000u 0:00.000
But the image seems corrupt and I cannot open it.
Re: convert grayscale tif to psd, create very large psd-file
Posted: 2017-10-17T09:44:15-07:00
by snibgo
Can't open it with what?
For me, using just
Code: Select all
convert 072017McCain_grayscale.tif -compress RLE x.psd
... x.psd opens fine with Photoshop CS2 v9.0 and Gimp v2.8.10 and IM v6.9.5-3. The compression is only 50%.
Using...
Code: Select all
convert 072017McCain_grayscale.tif -alpha off -compress rle -type bilevel -depth 1 x.psd
... Gimp and IM can read it, but PS can't. The compression is better, at 8%.
Re: convert grayscale tif to psd, create very large psd-file
Posted: 2017-10-17T14:51:21-07:00
by fmw42
snibgo wrote:Can't open it with what?
It was Mac PREVIEW, which opens the input fine. However, GraphicConverter opens the output fine. On my Mac, there is no preview icon as on the input. So that may be part of the issue for PREVIEW?
Re: convert grayscale tif to psd, create very large psd-file
Posted: 2017-10-17T23:14:54-07:00
by mop
Thanks for th ereply to snigbo and Fred.
This works very fine for me.
Re: convert grayscale tif to psd, create very large psd-file
Posted: 2017-11-01T02:38:40-07:00
by mop
Sorry. It shows up, that this was not all that fine.
When I call
convert 072017McCain_grayscale.tif -compress RLE grayscale.psd
using ImageMagick 7.0.7-7 on linux, I can not open the psd-file in Photoshop (both CS6 and CC2017).
I got the error: "Could not complete your request because an unexpected end-of-file was encountered". Smae thing happnes without the -compress clause.
But using ImageMagick 7.0.4-7 it works fine.
(ImageMagick can read the resulting file in both situations).
Re: convert grayscale tif to psd, create very large psd-file
Posted: 2017-11-01T10:18:11-07:00
by fmw42
Using IM 7.0.7.4 or 7.0.7.8 with the following command will not open with the same message in GIMP.
Code: Select all
magick 072017McCain_grayscale.tif -compress RLE grayscale.psd
Similarly for IM 6.9.9.20 (Q16 Mac OSX)
Code: Select all
convert 072017McCain_grayscale.tif -compress RLE grayscale.psd
It does not open even with -compress none.
However, if you add -strip, then it opens fine in GIMP. So something is odd in the meta data.
Code: Select all
magick 072017McCain_grayscale.tif -strip -compress RLE grayscale.psd