Legacy ImageMagick Discussions Archive

The -metric AE is completely different to PAE. AE only returns a boolean (error or not-error) result, and a find count of the number of pixels. So normally is ANY pixel is different it is different! [b]compare xc:black xc:cyan -metric AE null:[/b] 1 However AE is one of the few metrics effected by ...

You can set the output depth with -depth or +depth, but: JPEG is always 8 bits/channel. GIF is up to 256 colours, each of which is 8 bits/channel. PNG is either 8 or 16. TIFF is anything. Within those limits, the output depth is often set to the input depth. For PNG files, IM may reduce the bit ...

So by default IM write output as Q16?

And if i use:
magick compare -metric PAE -fuzz 0% 1px1st.png 1px2nd.png -depth 16 1pxDiff.png
This should output Q8 number not Q16?

Using Windows, in properties in Bit Depth there is 24bit (8bit per channel).
In Photoshop/Gimp there is also 8bit per channel when i'm using color sample tool.

What about function?

I don't know what formula gives you 6502500. I used this formula: "%[fx:(100)*sqrt( ( (u.r-v.r)^2 + (u.g-v.g)^2 + (u.b-v.b)^2 )*u.a*v.a/3 + (u.a-v.a)^2 ) ]%%" I thought that 100 = fuzz 100%. I think here i might have error. I just want to put for example -fuzz 3% and then i know that this is equal ...

I used GIMP to creat 1x1 image. Then i fill one image with 0,0,0 (RGB). Second image i fill with 255,255,255. To compare i used: magick compare -metric PAE -fuzz 0% 1px1st.png 1px2nd.png 1pxdiff.png 65535 (1) As output i get 65535 (1). So with 100% fuzz or with fuzz 65535 i should get both pixels ...

For my Excel file i used:
fx:(100)*sqrt( ( (u.r-v.r)^2 + (u.g-v.g)^2 + (u.b-v.b)^2 )*u.a*v.a/3 + (u.a-v.a)^2 )

For IM i used: magick compare -metric PAE -fuzz 0% 1px1st.png 1px2nd.png 1pxdiff.png

This is 1x1px image.

Hi again, Thank You both for explaining all things but... Unfortunately it mismatch with my excel file witch i did based on Formula used in IM. I made 1x1 image. For px 0,0,0,255 and 255,255,255,255 i've got 6 502,5 with Fuzz 1% and 6 502 500 with Fuzz 100%. Based on above from black to white range ...

Hi everyone, I need to know what does some values mean. For example: 1) magick compare -metric AE -fuzz 0% -extract 350x200+459+175 Org.png Compare.png OrgDiff00.png 2) magick compare -metric AE -fuzz 0.5% -extract 350x200+459+175 Org.png Compare.png OrgDiff05.png 3) magick compare -metric AE -fuzz ...