Re Averaging images

Message-ID:<uNOdnfFyldBDPCfUnZ2dnUVZ_tPinZ2d@giganews.com>
Subject:

Re: Averaging images

Date:Fri, 13 Mar 2009 19:11:42 +0100


On Thu, 12 Mar 2009 01:43:57 +0000, Ricky Rudolph wrote:

> Ofnuts wrote:
>> Given a set of identical images (except for random noise) is there a
>> way to compute the average image (ie, for each pixel and each color
>> channel,
>>   the value of the final image is the average of the value for the same
>> pixel in all input images). Layer in additive mode are pretty close but
>> since there is no division  by the number of layers you end up with
>> pure white very quickly.
> 
> You can use ImageMagick for that purpose. To compute the average of,
> say, 3 files, you can do something like
> 
>      convert -average image1.jpg image2.jpg image3.jpg average.jpg
> 
> The -average operation takes a series of file names as input; the last
> file name is that of the output file. Information about the ImageMagick
> command-line tool can be found at:
> 
>      http://www.imagemagick.org/script/command-line-options.php

Ricky, 

I don't know if this helped the Ofnuts, but you just saved me a ton of 
work. Hadn't heard of ImageMagick before, but have been playing with it 
for about three hours now non-stop.

thanks!

Message-ID:<49babb5e$0$24022$426a74cc@news.free.fr>
Subject:

Re: Averaging images

Date:Fri, 13 Mar 2009 21:00:30 +0100


arkster wrote:
> On Thu, 12 Mar 2009 01:43:57 +0000, Ricky Rudolph wrote:
> 
>> Ofnuts wrote:
>>> Given a set of identical images (except for random noise) is there a
>>> way to compute the average image (ie, for each pixel and each color
>>> channel,
>>>   the value of the final image is the average of the value for the same
>>> pixel in all input images). Layer in additive mode are pretty close but
>>> since there is no division  by the number of layers you end up with
>>> pure white very quickly.
>> You can use ImageMagick for that purpose. To compute the average of,
>> say, 3 files, you can do something like
>>
>>      convert -average image1.jpg image2.jpg image3.jpg average.jpg
>>
>> The -average operation takes a series of file names as input; the last
>> file name is that of the output file. Information about the ImageMagick
>> command-line tool can be found at:
>>
>>      http://www.imagemagick.org/script/command-line-options.php
> 
> Ricky, 
> 
> I don't know if this helped the Ofnuts, but you just saved me a ton of 
> work. Hadn't heard of ImageMagick before, but have been playing with it 
> for about three hours now non-stop.
> 

It definitely helped :-)
-- 
Bertrand

Message-ID:<uNOdnfFyldBDPCfUnZ2dnUVZ_tPinZ2d@giganews.com>
Subject:

Re: Averaging images

Date:Fri, 13 Mar 2009 19:11:42 +0100


On Thu, 12 Mar 2009 01:43:57 +0000, Ricky Rudolph wrote:

> Ofnuts wrote:
>> Given a set of identical images (except for random noise) is there a
>> way to compute the average image (ie, for each pixel and each color
>> channel,
>>   the value of the final image is the average of the value for the same
>> pixel in all input images). Layer in additive mode are pretty close but
>> since there is no division  by the number of layers you end up with
>> pure white very quickly.
> 
> You can use ImageMagick for that purpose. To compute the average of,
> say, 3 files, you can do something like
> 
>      convert -average image1.jpg image2.jpg image3.jpg average.jpg
> 
> The -average operation takes a series of file names as input; the last
> file name is that of the output file. Information about the ImageMagick
> command-line tool can be found at:
> 
>      http://www.imagemagick.org/script/command-line-options.php

Ricky, 

I don't know if this helped the Ofnuts, but you just saved me a ton of 
work. Hadn't heard of ImageMagick before, but have been playing with it 
for about three hours now non-stop.

thanks!

Message-ID:<49babb5e$0$24022$426a74cc@news.free.fr>
Subject:

Re: Averaging images

Date:Fri, 13 Mar 2009 21:00:30 +0100


arkster wrote:
> On Thu, 12 Mar 2009 01:43:57 +0000, Ricky Rudolph wrote:
> 
>> Ofnuts wrote:
>>> Given a set of identical images (except for random noise) is there a
>>> way to compute the average image (ie, for each pixel and each color
>>> channel,
>>>   the value of the final image is the average of the value for the same
>>> pixel in all input images). Layer in additive mode are pretty close but
>>> since there is no division  by the number of layers you end up with
>>> pure white very quickly.
>> You can use ImageMagick for that purpose. To compute the average of,
>> say, 3 files, you can do something like
>>
>>      convert -average image1.jpg image2.jpg image3.jpg average.jpg
>>
>> The -average operation takes a series of file names as input; the last
>> file name is that of the output file. Information about the ImageMagick
>> command-line tool can be found at:
>>
>>      http://www.imagemagick.org/script/command-line-options.php
> 
> Ricky, 
> 
> I don't know if this helped the Ofnuts, but you just saved me a ton of 
> work. Hadn't heard of ImageMagick before, but have been playing with it 
> for about three hours now non-stop.
> 

It definitely helped :-)
-- 
Bertrand