41695904$1@news.povray.org...
>> I rendered the image like this +w6400 +h4800 +SR0.44 +ER0.64 +SC0.55
>> +EC0.75 and in BMP format is very big, it's 87'9 Mb. Is it normal?
>
> 6400 x 4800 pixels (30 Mpix image)  x  3 bytes (24 bit image)  =  92160000 
> bytes
> which corresponds to the 87.9 MB you have (the BMP header adds a few more 
> bytes).
>
> I'd suggest you save your images using a lossless compression format
> such as PNG or TIFF.  Just use the POV-Ray +FN flag (for PNG) while 
> rendering,
> or convert the BMP to e.g. PNG using your favorite image editor.

Note that I personally favour BMP for output. The main reason is that images 
of this size take ages to save in PNG in the image editing program I'm using 
(and in the other I tested), so working on large PNG files can be really 
painful. Saving and loading BMPs is extremely fast in comparison.

Also, while partial BMP files seem to be fool-proof, partial PNG files can 
be a problem (my editor don't open them for instance), so I don't think it's 
advisable to use PNG as an output format in this case (converting the BMP to 
PNG after the render is advisable). Of course, these PNG-related issues may 
not exist with the image editor Oleguer is using, so your mileage may 
vary...

G.

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