Selected conversion from PNG to TXT

[AndreaImage]

Hi

i need to convert from PNG to TXT
but i don't need to convert all the image
i need to know only the information releated to the white pixel

i already perform something with a double DO LOOP using another library but it takes some minute (about 5) because the image it's quite big

is there some other way using Imagemagick ?

maybe compiling some batch file...

thank to everyone

[snibgo]

How do you convert "from PNG to TXT"? That sounds like OCR (optical character recognition), which IM doesn't do. A program called tesseract can do that.

IM can be useful for preparing an image for OCR.

Without seeing your image, further advice is difficult.

[AndreaImage]

more easy

if you run -convert c:\image.png c:\image_out.txt

in the text file you will find for each pixel the releated color

but i don0t need all the pixel, just the white pixel

is not an ocr application

i just need to know where are located the white pixels in the image

thanks

[snibgo]

Okay, you want the locations of all the white pixels.

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convert in.png +transparent White sparse-color:

[fmw42]

Snibgo: Should I suggest that sparse-color: be changed to output as list rather than a string?

[snibgo]

Well, it's a pain having to split it into lines.

coders\txt.c function WriteTXTImage() once had code to test for an attribute that was supposed to insert '\n' characters. But that code has since been removed.

I think it's dangerous to change IM so it always breaks into lines. But adding an option to tell it to do so would be useful.

[glennrp]

To get a list of the white pixels:

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magick image.png txt:- | grep white

[snibgo]

magick image.png txt:- | grep white

Yes, provided the input is fully opaque. If it has transparency, "white" is written as "srgba(255,255,255,1)".

[AndreaImage]

thanks for the reply

just some question

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 convert in.png +transparent White sparse-color: 

is this code write the output to some files?

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 image.png txt:- | grep white 

i don't think that "grep" is for Windows, i read somewhere to use find, is necessary to declare the output file?

thanks again

[fmw42]

Use redirect:

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convert in.png +transparent White sparse-color: > textfile.txt

or

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convert image.png txt:- | grep "white" > textfile.txt

Search google for "grep for windows"

http://gnuwin32.sourceforge.net/packages/grep.htm
http://www.wingrep.com/
http://www.wingrep.com/download.htm

Lots of results.

[snibgo]

Or:

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convert in.png +transparent White sparse-color:textfile.txt

The Microsoft program is called "findstr". So:

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convert in.png txt:- | findstr white

or

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convert in.png txt:- | findstr white >textfile.txt

This is far slower than the previous method.

[AndreaImage]

Thanks again

just last question

is it possibile to revert the output to the text file but just one information to each line?

thanks again

[fmw42]

In unix, you can do

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convert in.png  +transparent White sparse-color: | tr " " "\n"