[Magick-bugs] irreversible convert to pdf

[Maciej Pilichowski]

> Does your PNG image have a virtual canvas associated with it?  

I am not aware of this (I mean, I didn't do anything to this image 
manually). But my point is not what the source image file 
(.png, .jpg) contains, but the problem with converting pdf back to 
the image. I.e. the information is in the pdf for sure, because I can 
see good quality there, now I would like to convert pdf file to png 
(lossless format) keeping quality of pdf file.

> Add 
> +repage. 

Here we go:

# convert x.png x.pdf

Both files, the same quality (visually).

# compare -metric mae x.pdf x.png null:
1769.99 (0.0270083)

# convert x.png +repage x.pdf

Now x.pdf is smaller than before, but:

# compare -metric mae x.pdf x.png null:
1769.99 (0.0270083)

I get the same values. And the key part:
# convert x.pdf y.png

I get the same size image, but the content is so tiny -- all data 
(non-white pixels) are put in the left, bottom corner. 

Maybe I could attach all three files?

Kind regards,