difference between images : original versus image restored from text image

Posted by Jarek Grodek on
URL: http://imagej.273.s1.nabble.com/difference-between-images-original-versus-image-restored-from-text-image-tp3703039.html

hello
i experienced something strange and unexpectable for me, i thought.
i have an image, i save it as a text image. when i open again original
image and import text image (it resukts in 32 bit for restored text
image) and substract one from another....wow, i expected plane dark
field with brightness value eqaul 0 in every pixel. i checked this many
times and i don't understand what's going on. i work on text image in
excel and when i try to localize interesting parts of original image
according to coordinates and brightness value of single pixel i find
this same problem, brightness of original is not the same as on the text
image.

what can i do about it?

i'm using ImageJ 1.37a with Java 1.5.0_06 from WCIF

greetings,

Jarek