my shell hangs on this command:
/usr/local/bin/convert -size 298x71 -background black -fill white -stroke none -gravity center -trim -interline-spacing 0 -font /home/amazingw/public_html/live/fonts/Phillies.ttf label:'150' png:-
The shell just sits there until i press ctrl+c. If I add any letter to the label: argument the command runs fine and I get output.
The font is there but it is missing the number characters in the definition.
Could that cause my command to fail?
This seems like an issue related to input at the console, I am assuming you are using Bash.
If this is the case, Bash is trying to interpret the quotes and is waiting for other input.
after reviewing the imagemagick website for "label:"
Label - Simple Text Label
Basic Labels
Creating a font image using a "label:" image,
is the more typical way of drawing a font
quickly in ImageMagick...
It goes on and gives many examples...
convert -background lightblue -fill blue \
-font Candice -pointsize 72 label:Anthony \
label.gif
None of the examples show single quotes.
I would assume between Bash and ImageMagick's convert program, there is some error on interpretation of input from the console.
I would suggest trying your same command without quotes
/usr/local/bin/convert -size 298x71 -background black -fill white -stroke none -gravity center -trim -interline-spacing 0 -font /home/amazingw/public_html/live/fonts/Phillies.ttf label:150 png:-
I would also take a quick look at the Bash manual about single quotes too.
I was able to test using a modified version of the font which contained the digits. Command went smoothly and an output image was returned. This pretty much narrows it down to an ImageMagick problem with handling labels. Looks like if the label is made out only of characters which are missing in the font (the resulting output image would be empty) - in that case ImageMagick hangs until ctrl+c is pressed - especially problematic as I'm running this from php's proc_open.
Related
I am looking for a way to batch process images in bash.
Is there any way to fill up specific part of image?
Example:
I want to fill up the red part with white color. The red part is always on the top left corner, size is 135x35px.
Yes, Gimp/Photoshop is one way to do this, but I have lot of images and I love automatize things with bash.
Sure, use ImageMagick - installed on most Linux distros and available for OSX and Windows.
convert input.png -fill white -draw "rectangle 0,0 135,35" result.png
If you have many files, make a COPY in a spare folder and try this and it will probably do them all
mogrify -fill white -draw "rectangle 0,0 135,35" *.jpg
I'm converting pdf files to images with ImageMagic, everything is ok until I use -resize option, then I get image with black background. I use this command:
convert -density 400 image.pdf -resize 25% image.png
I need to use -resize option otherwise I get really large image. Is there any other option which I can use to resize image or is there option to set background in white.
That's not a Ghostscript command, You will need to find out what convert is sending to Ghostscript. As it stands I can't even be sure that your problem is with Ghostscript ,since it could easily be something that convert is doing.
Solved it by removing alpha from image, it seems imagemagic tries to apply some opacity but since jpeg doesn't allow transperency result was black background. So I found example on imagemagic website and it helped me:
convert a.pdf -background skyblue -alpha remove -alpha off a_remove.jpg
The situation is : I have many images of documents from scanning. I want to keep the document's main content - which is printed in color black (a small range of colors around #000000). But, you know, the documents are always full of colors : stamp, background, decorations, logos...etc.
I just want to keep the TEXTS ONLY which were printed in the color black.
I've tried with ImageMagick and this command so far:
convert X.png -matte (+clone -fuzz 20% -transparent "#000000") -compose DstOut -composite X1.png
But the result was not as expected , the text was very damaged that I cannot read.
Someone suggested me to increase the fuzz to 70%:
convert X.png -matte (+clone -fuzz 70% -transparent "#000000") -compose DstOut -composite X1.png
Then the text appeared to be more readable, but the other colors kept remaining too.
Can you please show me a better solution for my situation? Every suggestion would be highly appreciated!
To match all colors except black you can use +opaque "#000000".
In order to include a little range around #000000 you can try different percentages with the fuzz operator:
convert input.png -fill white -fuzz 10% +opaque "#000000" result.png
Tested with ImageMagick 6.6.0-1 on Windows
I stumbled upon this question while looking for an answer to this question. I found a couple imagemagick forum posts that helped. Here is what I came up with:
convert input.gif -matte \( +clone -fuzz 1 -transparent black \) -compose DstOut -composite ~/Desktop/output.png
Forum post: ImageMagick: Removing all but one color
You should try the level command:
convert test.png -level 25%,75% test_level.png
How do I render a string in an ancient X11 bitmap font? I mean something like
-*-lucida-medium-r-normal-*-34-*-*-*-*-*-*-*
which I can find with xfontsel. I just need a command line tool etc. that displays a given string in that font. A similar TrueType font won't work, since it has to be pixel-perfect (I'm trying to get images of each letter to OCR an image in that font).
I'm not sure if there is a command line tool. But you can always roll your own with Xlib and C.
Somebody seems to have written a simple X11 C program that displays a string using Xlib. Changing a couple of lines and compiling with:
gcc -lX11 -o xrenderstring xrenderstring.c
.. should do it for you.
I've reproduced the entire program in this gist (in case it vanishes from the original source), modified to take two arguments: 1. fontname, 2. string to be rendered.
So you'd call it like (after compiling of course):
./xrenderstring "-*-lucida-medium-r-normal-*-34-*-*-*-*-*-*-*" "Quick brown fox"
To just render characters in that font:
xfd -fn '-*-lucida-medium-r-normal-*-34-*-*-*-*-*-*-*'
xfontsel -pattern '-*-lucida-medium-r-normal-*-34-*-*-*-*-*-*-*'
To render a specific string:
xfontsel -pattern '-*-lucida-medium-r-normal-*-34-*-*-*-*-*-*-*' -sample 'The quick brown fox jumps the shark'
Found a hackish way. Add the following to ~/.Xdefaults:
xedit*editWindow*font: -*-lucida-medium-r-normal-*-36-*-*-*-*-*-*-*
and then run
$ xrdb -merge ~/.Xdefaults
$ xedit
Then I typed the string in, took a screenshot, and compared it in gimp.
(Turns out the X11 font was not quite the right one after all. My source used Lucida Sans 36 pt (ttf), but without antialiasing and probably wierd hinting.)
You can use ImageMagick.
Added benefits:
can render old-fashioned (fixed) or TTF or other fonts
can render to screen or to image file (PNG, whatever)
Simple
For short text
echo "The quick brown fox jumps over the lazy dog." \
| convert \
-font '-*-fixed-*-*-*-*-18-*-*-*-*-*-iso8859-*' \
TEXT:- -trim fox.png
To render to screen:
echo "The quick brown fox jumps over the lazy dog." \
| convert \
-font '-*-fixed-*-*-*-*-18-*-*-*-*-*-iso8859-*' \
TEXT:- -trim MIFF:- | display MIFF:-
Remove -trim to see that ImageMagick uses a canvas to draw.
More control
Canvas size. To avoid two-step computations, create a canvas larger than needed and trim it afterwards.
Control background and foreground colors.
Control PNG parameters (one bit per pixel)
convert -size 2000x20 xc:black \
-font '-*-fixed-*-*-*-*-18-*-*-*-*-*-iso8859-*' \
-fill white \
-draw "text 0,15 'The quick brown fox jumps over the lazy dog.'" \
-trim +dither -depth 1 fox.png
The resulting image below weighs 592 bytes:
To get independently framed characters (for later composition)
You could put only one character in line above, but applying to several characters independently would cause the resulting images to no longer have a same size nor same common baseline.
for CHAR in H e l o ' ' W r d
do
convert -size 9x13 xc:black \
-font '-*-fixed-*-*-*-*-18-*-*-*-*-*-iso8859-*' \
-fill white -stroke none \
-draw "text 0,10 '${CHAR}'" \
+dither -depth 2 fixed_char_${CHAR}.png
done
The command below produces a PNG showing that individually framed images keep their common alignment:
montage -mode concatenate -tile x1 fixed_char_H.png fixed_char_e.png \
fixed_char_l.png fixed_char_l.png fixed_char_o.png fixed_char_\ .png \
fixed_char_W.png fixed_char_o.png fixed_char_r.png fixed_char_l.png \
fixed_char_d.png helloworld.png
I'm looking for a simple command-line tool (on Linux) to insert a text chunk (e.g. copyright) into a png file, resulting in a new png file:
> png-insert-text-chunk "here's my text chunk" < in.png > out.png
Note: by "insert a text chunk", I do not mean "draw some text on the image". I mean: insert the text into the png file as a chunk, in the technical sense. This can be used, for example, to insert a copyright message that isn't displayed on the actual image.
Use ImageMagick's convert and the -set option:
convert IN.png \
-set 'Copyright' 'CC-BY-SA 4.0' \
-set 'Title' 'A wonderful day' \
-set comment 'Photo taken while running' \
OUT.png
The -set option is used to set metadata elements. In the case of PNG these often go into tEXt chunks.
I have searched around for utilities to do this, and not yet found anything that really matches what I want to do. So I decided to build my own, which it turns out is not too hard. The utility png-text-dump displays all text chunks in a PNG image. It depends only on libpng. The utility png-text-append inserts text chunks into a PNG image. It depends only on the standard C library - I had initially tried to implement this using libpng, but actually found it easier to work from scratch using only the PNG specification.
Note: This answer was a response to the original revision of the question where it was not clear if the text had to be written on the image or if the text had to be embedded within the image binary file as metadata. This answer assumed the former. However the question was edited to clarify that it meant the latter. This answer is left intact, in case someone is looking for a solution to the former.
convert -draw "text 20,20 'hello, world'" input.png output.png
The 20,20 in the above example is the co-ordinate where I want to place the text.
You need to use the imagemagick package to get this command.
On Ubuntu or Debian, it can be installed with the command: apt-get install imagemagick.
Here is a slightly more elaborate usage of the command:
convert -font Helvetica -pointsize 20 -draw "text 20,20 'hello, world'" input.png output.png
This can be implemented with python pypng module. The python3 example code is below:
import png
TEXT_CHUNK_FLAG = b'tEXt'
def generate_chunk_tuple(type_flag, content):
return tuple([type_flag, content])
def generate_text_chunk_tuple(str_info):
type_flag = TEXT_CHUNK_FLAG
return generate_chunk_tuple(type_flag, bytes(str_info, 'utf-8'))
def insert_text_chunk(target, text, index=1):
if index < 0:
raise Exception('The index value {} less than 0!'.format(index))
reader = png.Reader(filename=target)
chunks = reader.chunks()
chunk_list = list(chunks)
print(chunk_list[0])
print(chunk_list[1])
print(chunk_list[2])
chunk_item = generate_text_chunk_tuple(text)
chunk_list.insert(index, chunk_item)
with open(target, 'wb') as dst_file:
png.write_chunks(dst_file, chunk_list)
def _insert_text_chunk_to_png_test():
src = r'E:\temp\png\register_05.png'
insert_text_chunk(src, 'just for test!')
if __name__ == '__main__':
_insert_text_chunk_to_png_test()
I believe that pngcrush has this ability: http://pwet.fr/man/linux/commandes/pngcrush
Adding to the comment made by #susam-pal, to change color use the option
-fill color
This option accepts a color name, a hex color, or a numerical RGB, RGBA, HSL, HSLA, CMYK, or CMYKA specification. See Color Names for a description of how to properly specify the color argument.
Enclose the color specification in quotation marks to prevent the "#" or the parentheses from being interpreted by your shell.
For example,
-fill blue
-fill "#ddddff"
-fill "rgb(255,255,255)"
Obtained from link