Script to find image width x length? (Solved)

[trio]

Dear puppians,

Is there a native puppy command to get an image size? Width x Length
Or if not native, can someone please lead me to it?

Thanks a lot

Note: the "file" command won't work with. Jppg

[SFR]

For BMP, GIF, JPG, TGA & TIF you could use exiv2 binary. I think it's present in all of Pups.
As for some other formats, here's a snippet I made some time ago that might be helpful:

Code: Select all

#!/bin/bash

FILENAME="$1"
[ "$FILENAME" ] || exit 1

FILENAME_TEMP=`echo "$FILENAME" | tr '[:upper:]' '[:lower:]'`

case ${FILENAME_TEMP##*.} in
  bmp|gif|png|jpg|jpeg|tga|tif|tiff)
    read X Y <<< `exiv2 "$FILENAME" 2>/dev/null | awk '/Image size/ {print $4,$6}'`
  ;;
  ico)
    read X Y <<< `file -b "$FILENAME" | awk -F',' '{split($2,a,"x"); print a[1]" "a[2]}'`
  ;;
  pcx)
    read X Y <<< `file -b "$FILENAME" | cut -d ']' -f2 | cut -d '[' -f2 | awk -F',' '{print $1+1,$2+1}'`
  ;;
  xpm)
    read X Y <<< `grep -m1 "\"" "$FILENAME" | tr -d "\"" | awk '{print $1,$2}'`
  ;;
  svg)
    X=`cat "$FILENAME" | tr -d ' \t' | grep -m1 -io "width=".[0-9]* | tr -cd '[[:digit:]]'`
    Y=`cat "$FILENAME" | tr -d ' \t' | grep -m1 -io "height=".[0-9]* | tr -cd '[[:digit:]]'`      
  ;;
  ppm|pnm)
    read X Y <<< `grep -v '#' "$FILENAME" | grep -a -m2 .[0-9] | tail -1 | awk '{print $1,$2}'`
  ;;
  *) echo "Not supported..."; exit 1
esac

echo "$FILENAME: ${X}x${Y}"

Doesn't work with certain .ico files, but otherwise it's quite reliable...

Greetings!

[Flash]

mtPaint shows the image size, at the bottom left corner. Right-click on the file, then choose Open with -> mtPaint.

[B.K. Johnson]

From your browser (Firefox), right-click on the picture and choose the option about view image info or something like that. Gives you the original dimensions and also that if scaled.
I found your picture is 80px × 62px. See screen shot

B.K. Johnson
[EDIT]
Reread your post and realized you were looking for a command. So my suggestion may not be what you want, however, I am leaving the reply in case someone else finds it useful.

[ASRI éducation]

Is there a native puppy command to get an image size? Width x Length

Hello Flash and B.K. Johnson.
Trio is not a novice.
It is probable that he is trying to develop a script.
Graphical interfaces are not going to help ...
Regards

[dejan555]

Not sure about native puppy command, but exiv2 can get image size from exif (not that every image has exif saved though)
EDIT: Googled and found an answer on stackoverflow that says that exiv2 will display size even if exif isn't saved, and I just tested it, see second output for image with no exif.

Code: Select all

13 root:960px$ data=$(exiv2 IMG_5834-960.JPG)
14 root:960px$ echo "$data" | grep "^Image size"
Image size      : 640 x 960

Code: Select all

1 root:IMG$ exiv2 2rVyRKI.jpg
File name       : 2rVyRKI.jpg
File size       : 600887 Bytes
MIME type       : image/jpeg
Image size      : 2576 x 1719
2rVyRKI.jpg: No Exif data found in the file

It would be interesting to know though.
If you want to embed image into gtkdialog there are <width></width> and <height></height> tags that will scale image of any size to given values.

[slavvo67]

See 2005 script posted by Tomchuk

http://ubuntuforums.org/archive/index.php/t-49309.html

I only tested it on one JPG but it seemed to work fine.


Slavvo67

[trio]

Thanks all for replying, I think I'm going to use eviv2 or SFR's script

Regards,

Trio

[01micko]

You can try netpbm tools

Eg:

Code: Select all

 jpegtopnm barrow-v-bolt-meme20.jpg|pnmfile
jpegtopnm: WRITING PPM FILE
stdin:	PPM raw, 600 by 800  maxval 255
### for jpeg
pngtopnm stamp99.png|pnmfile|grep [0-9]|awk '{print $4,$6}' 
300 200

There is also giftopnm, winicontoppm, ppmtogif, bmptoppm ..and so on.

http://netpbm.sourceforge.net


Working example, noisy on the console though

Code: Select all

#!/bin/sh

usage() {
	echo "$0 somepicture|.png|.jpg|.gif|.ico|.bmp"
		exit
}

[ "$1" ] || usage

case "$1" in
	*.jpg|*.JPG|*.jpeg*|*.JPEG)
			APP="jpegtopnm -nosmooth $*" ;;
	*.png)
			APP="pngtopnm $*" ;;
	*.gif)
			APP="giftopnm $*" ;;
	*.ico)  ## doesn't handle compressed .ico
			## and is inaccurate because they contain several sizes
			APP="winicontoppm $*|ppmtogif|giftopnm" ;;
	*.bmp|*.BMP)
			APP="bmptoppm $*|ppmtojpeg|jpegtopnm" ;;
	*) echo "unsupported" && exit ;;
esac

eval "$APP" |pnmfile|grep [0-9]|awk '{print $4,$6}'

[trio]

Thanks bro

SFR's script with a little modification just fits my need

Regards,


Trio

[technosaurus]

Since this is a programming thread, I will give some insight on how these tools work to identify the image type and various properties.

First the program has to determine the image type. This is done by looking at specific file offsets for a "magic" string or number. I wrote a reimplementation of file --mime-type that does this pretty efficiently here:
https://github.com/technosaurus/MIMEtype

Once the image type is determined, you can get the image properties from predefined offsets for that image type.
for png the magic at offset 0 is (decimal representation of each byte):

here is a basic template

Code: Select all

#include <stdio.h>
union{
	struct { char hdr[8]; int width; int height; }png;
	struct { char hdr[5]; char width; char height; }dummy;
}img;

char png_magic[8]={137, 80, 78, 71, 13, 10, 26, 10};
char dummy_magic[5]="dummy";

#define CHECK(x) if(!memcmp(img.x.hdr,x##_magic,sizeof(x##_magic))) \
	return !printf("%s %dx%d\n",#x,img.x.width,img.x.height)

int main(void) {
	read(0,&img,sizeof(img));
	CHECK(png);
	else CHECK(dummy);
	return 1;
}

thisprogram <mypic.png

There is another way to do this using a loop and sets of structs here:
http://landley.net/hg/toybox/file/tip/t ... er/blkid.c
... but with this way you would need extra parameters for the size of each property (some widths may be 16 bits while other formats use 32 ... some audio formats even use only 7 bits of each byte for packet lengths)
see http://www.aivosto.com/vbtips/imageformats.html
XPM is a special case since the text format causes the offset for width and height to be at various offsets due to the variable length name field that is used for embedding in C.

edit - simplified for little endian (x86 and x86_64) example:

Code: Select all

#include <stdio.h>
union{
 struct{short m;char p[16];int w;int h;char P[2];short b;}bmp;
 struct{int m;char p[2];short w;short h;char P;char b;}gif;
 struct{int m;char p[12];int w;int h;char b;}png;
}i;
int bmp='B'|'M'<<8, gif='G'|'I'<<8|'F'<<16|'8'<<24, png=137|80<<8|78<<16|71<<24;
#define _(x) if(i.x.m==x) return !printf("%s %dx%d@%d\n",#x,i.x.w,i.x.h,i.x.b)
int main(void) {
	fread(&i,1,sizeof(i),stdin);
	_(png); else _(gif); else _(bmp); else return 1;
}

[technosaurus]

You can try netpbm tools

Its pretty easy to turn all of those little netpbm programs into a single multicall binary (couple lines of awk on one of the header files and ~ a minute or two of editing) ... I think I sent them a patch already, but I could look into it again. I cut the on disk size drastically even when statically compiled.