Convert GIF (or PNG or JPG) to a 4-bit PGMA

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Raconteur

Convert GIF (or PNG or JPG) to a 4-bit PGMA

Post by Raconteur »

Hi all,

I need to convert a bunch of images (could make them whatever in PS) to 4-bit PGMAs.

I am currently using:

Code: Select all

convert -compress none -colors 16 -depth 4 source.GIF source.PGM
When I open the PGM in a text editor it is specifying 256 colors, and has values > 15.

I have tried interim conversion such as using -define png:color-type=0 and -define png:bit-depth=4 to convert to a PNG, and then to a PGMA, but same result.

Am I doing something wrong, or is there a bug with this?

Thanks for any input!

Chris
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fmw42
Posts: 25562
Joined: 2007-07-02T17:14:51-07:00
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Location: Sunnyvale, California, USA

Re: Convert GIF (or PNG or JPG) to a 4-bit PGMA

Post by fmw42 »

don't know if this will make any difference but the current IM 6 syntax should be, I believe in this case,

convert input options output

convert source.GIF -compress none -colors 16 -depth 4 source.PGM


see

http://www.imagemagick.org/Usage/basics/#why
Raconteur

Re: Convert GIF (or PNG or JPG) to a 4-bit PGMA

Post by Raconteur »

Thanks a TON. Will try that and see if it helps.
Raconteur

Re: Convert GIF (or PNG or JPG) to a 4-bit PGMA

Post by Raconteur »

Damn... had high hopes.

Using:

Code: Select all

compress source.GIF -compress none -depth 4 -colors 16 source.PGM
this is what I get as output:

Code: Select all

P2
#by ToyViewer
64 256
255
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
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0 0 0 0 0 0 0 0 102 102 102 102 102 102 102 102 102 0 0 0 0 0 0 0 0 0 0 0 0 0 
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0 0 0 0 0 102 255 255 255 255 255 255 255 255 255 51 0 0 0 0 0 0 0 0 0 0 0 0 0 
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255 255 204 204 255 204 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
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255 255 255 255 255 255 255 153 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
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255 255 255 255 255 255 204 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 204 255 255 255 255 255 
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 51 51 51 51 51 51 51 51 
51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 
51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 
51 51 51 51 
It seems to me that the -compress none flag is somehow forcing 8-bit depth.

If I try to convert this PGM to another PGM using:

Code: Select all

compress source.PGM -depth 4 -colors 16 source.PGM
I get:

Code: Select all

P5
#by ToyViewer

64 256
15
but the rest seems empty.

I can, however, do:

Code: Select all

display source.PGM
and IM will open X11 and show the image, which looks exactly how I want it.

Why can I not see the map in the text editor?

Ultimately what I need is a PGMA with 15=white, 0=black, and everything in between mapped to the remaining 14 shades of gray. The GIF I am starting with is Indexed and has only 8 colors in it.

Can someone give me the "Magick" to do this?

Thanks all!

Chris
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fmw42
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Re: Convert GIF (or PNG or JPG) to a 4-bit PGMA

Post by fmw42 »

I think you need to write out the PGM image so that the values are scaled to 0-15 (from 0-255) and set the header so that it is P2 and has maxgraylevel of 15. See

try something like

convert source.GIF -evaluate divide 16 -compress none result.pgm

or

convert source.GIF -evaluate divide 16 -compress none PGM:result.pgm

or possibly

convert source.GIF -evaluate divide 16 -compress none P2:result.pgm

I am not sure if IM will honor the P2:

Otherwise, you may need to scale the values, write to text, then create the pgm file with NetPBM or manually. see the P2 example at http://netpbm.sourceforge.net/doc/pgm.html, though I have little experience doing that.

Are you on the most current IM? What about your version of NetPBM, is it current?
Raconteur

Re: Convert GIF (or PNG or JPG) to a 4-bit PGMA

Post by Raconteur »

Ok... so this worked, but I am not sure why I had to make one change. Perhaps you can elucidate?

I used:

Code: Select all

convert source.GIF -evaluate divide 16 -compress none source.PGM
That worked, except, it was still an 8-bit image. I noticed that the maxgray value was set to 255, however, the max value of the pixels was 16. It should be 15.

So, I changed the call to:

Code: Select all

convert source.GIF -evaluate divide 17 -compress none source.PGM
and that spit out the proper range of values.

Then I had to hand-modify the maxgray value to 15.

I have two questions... #1 how can I get the conversion to write the 15 as maxgray?
#2 why did I have to divide by 17 to get the values to drop into the range 0-15?

Thanks a MILLION for the help!

Chris
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Re: Convert GIF (or PNG or JPG) to a 4-bit PGMA

Post by GreenKoopa »

Raconteur wrote:#2 why did I have to divide by 17 to get the values to drop into the range 0-15?
255 / 16 = 15.9375
255 / 17 = 15.0000

I guess you get rounding, not an integer division. A shift evaluate would give you different results. What results do you intend? A 0 will stay a 0. A 255 should become a 15. What should a 15 become?
Raconteur

Re: Convert GIF (or PNG or JPG) to a 4-bit PGMA

Post by Raconteur »

Hi GK,

That makes sense now...

I think I might need to quantize the image, but am not sure how to.

Basically, the image I am starting with has only 16 shades of gray. I need a PGM where black is 0, white is 15, and the other 14 colors map 1:1 (#111111 = 1, #222222 = 2, ..., $EEEEEE = 14).

Ultimately I need the header of the PGM to read:
P5
#by ToyViewer

64 256
15

Is quantize the right function? The other responses have gotten me very close, but not quite there...
Raconteur

Re: Convert GIF (or PNG or JPG) to a 4-bit PGMA

Post by Raconteur »

Well, this seems to solve it... on http://www.imagemagick.org/Usage/formats/#netpbm it says:
You can only specify 8-bit and 16 bit depth for the output quality for PGM and PPM. A finer control than this is currently not possible, though a future proposal has also been suggested.
So it looks like the -evaluate divide 17 trick and then hand-altering the maxgray 255 to 15 is the solution.

I am going to try NetPBM to see if I can get it there (this has to be done by some very non-technical folks).

Any other input or suggestions greatly appreciated!
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Re: Convert GIF (or PNG or JPG) to a 4-bit PGMA

Post by anthony »

IM netpbm output is limited to 8 and 16 bit depth. setting the Maxval Netpbm setting is an option i would like to see added to the netpbm coder.

However you can post process using the netpbm command "pnmdepth" to change the final depth.

An example of this is in IM examples, File Formats, NetPBM
http://www.imagemagick.org/Usage/formats/#netpbm

Code: Select all

convert rose:[10x10+0+0] -colorspace gray -transpose -depth 16 PGM:- |\
    pamdepth 99 | pnmnoraw
P2
10 10
99
18 18 17 17 18 18 19 21 22 21
19 18 17 17 18 18 20 21 22 21
20 19 18 18 18 19 20 22 24 23
20 20 18 18 18 19 21 23 24 25
20 20 18 17 17 19 21 24 25 26
20 19 18 17 17 19 20 23 26 26
19 19 18 17 16 18 19 23 25 26
20 20 18 17 15 17 18 22 25 27
19 20 18 17 16 17 19 22 25 26
19 20 18 17 17 16 18 21 24 25
In that example a array of color values from 0 to 99 was created.

NOTE: I recommend you specifically set -depth 16 for the initial PGM image output so as to give the most accurate result when pnmdepth reduces the color value range.

You already figured out the other technique of using -evaluate. However the +level may work better as you can actually exactly specify the final 'maxvalue' for the pixels, even if the 'maxvalue' in the PGM file is not correct..

Code: Select all

convert rose:[10x10+0+0] +depth -colorspace gray -transpose +level 0,99 PGM:- | pnmnoraw
P2
10 10
65535
18 18 17 17 18 18 19 21 22 21
19 18 17 17 18 18 20 21 22 21
20 19 18 18 18 19 20 22 24 23
20 20 18 18 18 19 21 23 24 25
20 20 18 17 17 19 21 24 25 26
20 19 18 17 17 19 20 23 26 26
19 19 18 17 16 18 19 23 25 26
20 20 18 17 15 17 18 22 25 27
19 20 18 17 16 17 19 22 25 26
19 20 18 17 17 16 18 21 24 25
Note that "pnmnoraw" is still used rather that using a -compress none as it restores the 'image row' to 'text file line' correspondance. IM NetPBM coder does not do this preservation.

Here +depth resets the input images depth to match IM internal 'quality'. This should be either Q8 or Q16, as it will fail for Q32 and Q64 due to NetPBM dividing the images internal Quality to match the external depth. The internal Depth/Quality will be what will appear on the thrid line of the output, so will be either 255 or 65535.

And finally here I use 'sed' to reset that value in 'noraw' PGM text file format.

Code: Select all

convert rose:[10x10+0+0] +depth -colorspace gray -transpose +level 0,99 PGM:- | pnmnoraw | sed '3s/^.*$/99/'
P2
10 10
99
18 18 17 17 18 18 19 21 22 21
19 18 17 17 18 18 20 21 22 21
20 19 18 18 18 19 20 22 24 23
20 20 18 18 18 19 21 23 24 25
20 20 18 17 17 19 21 24 25 26
20 19 18 17 17 19 20 23 26 26
19 19 18 17 16 18 19 23 25 26
20 20 18 17 15 17 18 22 25 27
19 20 18 17 16 17 19 22 25 26
19 20 18 17 17 16 18 21 24 25
ASIDE: I was the person to make the vital 1995 patch release of NetPBM, during a time when little work was being done on the software. Because of this I have a good understanding of the PbmPlus software and image file format.
Anthony Thyssen -- Webmaster for ImageMagick Example Pages
https://imagemagick.org/Usage/
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magick
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Re: Convert GIF (or PNG or JPG) to a 4-bit PGMA

Post by magick »

IM netpbm output is limited to 8 and 16 bit depth. setting the Maxval Netpbm setting is an option i would like to see added to the netpbm coder.
Use -depth to set the Netpbm max value:
  • convert logo: -depth 4 logo.pnm
    more logo.pnm
    P6
    640 480
    15
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anthony
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Re: Convert GIF (or PNG or JPG) to a 4-bit PGMA

Post by anthony »

That is a new change, but still limited to 2^N-1 maxvals.
Anthony Thyssen -- Webmaster for ImageMagick Example Pages
https://imagemagick.org/Usage/
Raconteur

Re: Convert GIF (or PNG or JPG) to a 4-bit PGMA

Post by Raconteur »

Hi Magick,

I tried that, but what results is a PGM file that when I open with a text editor I cannot see the pixel map... it is all unprintable characters. Basically, I need to take that block of text (the pixmap) and throw it into a C struct, so I need to be able to see the raw data. Am I doing something wrong there? The image, even though you cannot read the actual file, does display properly when using IM display, or opening in PS (needs to some tweaking to display properly, but the data is correct).

Anthony, THANK YOU for illuminating all of that. I had read most of what you referred to but it did not make complete sense. I tried a couple of approaches and had some difficulty, and am hoping I can get you to just spoon-feed this to me. Here is what I did:

Code: Select all

convert source.GIF -colorspace gray -transpose -depth 16 temp.pgm
(is -transpose necessary? I applied it but just read what it does and I don't think I want that...)

then I ran:

Code: Select all

convert temp.pgm +depth -colorspace gray -transpose +level 0,15 temp2.pgm
(am I correct that using + in front of a parameter resets it to the default, overriding any changes, or does it do something else entirely?)

and then finally:

Code: Select all

convert temp2.pgm -depth 4 PGM:- | pnmnoraw
(this was a total guess, and it bombed with "pnmnoraw: command not found. I am running IM 6.6.4, btw).

I would love to know what I did wrong, but ultimately I need to get this done today. Would you be so kind as to write the actual commands to go from a GIF to a 4-bit PGM, using real files, not the constructed ones from IM (I am getting thrown with the PGM: stuff, as I don't know what is actual IM command and what is telling the shell to write the resultant file - my *nix chops are rusty at best ;) ).

Thanks for all the help, you guys are saving my butt!

Cheers,

Chris
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magick
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Re: Convert GIF (or PNG or JPG) to a 4-bit PGMA

Post by magick »

Add '-compress none' to your command line.
Raconteur

Re: Convert GIF (or PNG or JPG) to a 4-bit PGMA

Post by Raconteur »

To the last command? In place of "PGM:- pnmnoraw"?

That is what I was originally doing, but that leaves me with the problem I described... It does not produce a human-readable file.
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