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So I've figured out how to convert images to prores with no colorspace shifts using either:

-vf colormatrix=bt601:bt709 filter for 8bit material

and

-vf colorspace=all=bt709:range=pc:format=yuv444p10:iall='bt601-6-625':irange=pc filter for 10bit material.

However, whenever I use colormatrix or colorspace filters the output file contains no alpha channel. As soon as I remove these filters the alpha channel is present but now I've got a color shift.

#this generates no alpha
ffmpeg -f image2 -r 24.0 -i tif_w_alpha.%3d.tif -c:v prores_ks -profile:v 5 -pix_fmt yuva444p10le -vf colorspace=all=bt709:range=pc:format=yuv444p10:iall='bt601-6-625':irange=pc -alpha_bits 16 this_has_no_alpha_channel.mov

#this has alpha but also a color shift
ffmpeg -f image2 -r 24.0 -i tif_w_alpha.%3d.tif -c:v prores_ks -profile:v 5 -pix_fmt yuva444p10le -alpha_bits 16 this_has_alpha.mov

This behavior is the same in both -profile:v 4 and 5 which are the only 2 that support alpha. How can I get the color filter to work without losing the alpha channel?

So I've figured out how to convert images to prores with no colorspace shifts using either:

-vf colormatrix=bt601:bt709 filter for 8bit material

and

-vf colorspace=all=bt709:range=pc:format=yuv444p10:iall='bt601-6-625':irange=pc filter for 8bit or 10bit material.

However, whenever I use colormatrix or colorspace filters the output file contains no alpha channel. As soon as I remove these filters the alpha channel is present but now I've got a color shift.

#this generates no alpha
ffmpeg -f image2 -r 24.0 -i tif_w_alpha.%3d.tif -c:v prores_ks -profile:v 5 -pix_fmt yuva444p10le -vf colorspace=all=bt709:range=pc:format=yuv444p10:iall='bt601-6-625':irange=pc -alpha_bits 16 this_has_no_alpha_channel.mov

#this has alpha but also a color shift
ffmpeg -f image2 -r 24.0 -i tif_w_alpha.%3d.tif -c:v prores_ks -profile:v 5 -pix_fmt yuva444p10le -alpha_bits 16 this_has_alpha.mov

This behavior is the same in both -profile:v 4 and 5 which are the only 2 that support alpha. How can I get the color filter to work without losing the alpha channel?

So I've figured out how to convert images to prores with no colorspace shifts using either:

-vf colormatrix=bt601:bt709 filter for 8bit material

and

-vf colorspace=all=bt709:range=pc:format=yuv444p10:iall='bt601-6-625':irange=pc filter for 10bit material.

However, whenever I use colormatrix or colorspace filters the output file contains no alpha channel. As soon as I remove these filters the alpha channel is present but now I've got a color shift.

#this generates no alpha
ffmpeg -f image2 -r 24.0 -i tif_w_alpha.%3d.tif -c:v prores_ks -profile:v 5 -pix_fmt yuva444p10le -vf colorspace=all=bt709:range=pc:format=yuv444p10:iall='bt601-6-625':irange=pc -alpha_bits 16 this_has_no_alpha_channel.mov

#this has alpha but also a color shift
ffmpeg -f image2 -r 24.0 -i tif_w_alpha.%3d.tif -c:v prores_ks -profile:v 5 -pix_fmt yuva444p10le -alpha_bits 16 this_has_alpha.mov

How can I get the color filter to work without losing the alpha channel?

So I've figured out how to convert images to prores with no colorspace shifts using either:

-vf colormatrix=bt601:bt709 filter for 8bit material

and

-vf colorspace=all=bt709:range=pc:format=yuv444p10:iall='bt601-6-625':irange=pc filter for 10bit material.

However, whenever I use colormatrix or colorspace filters the output file contains no alpha channel. As soon as I remove these filters the alpha channel is present but now I've got a color shift.

#this generates no alpha
ffmpeg -f image2 -r 24.0 -i tif_w_alpha.%3d.tif -c:v prores_ks -profile:v 5 -pix_fmt yuva444p10le -vf colorspace=all=bt709:range=pc:format=yuv444p10:iall='bt601-6-625':irange=pc -alpha_bits 16 this_has_no_alpha_channel.mov

#this has alpha but also a color shift
ffmpeg -f image2 -r 24.0 -i tif_w_alpha.%3d.tif -c:v prores_ks -profile:v 5 -pix_fmt yuva444p10le -alpha_bits 16 this_has_alpha.mov

This behavior is the same in both -profile:v 4 and 5 which are the only 2 that support alpha. How can I get the color filter to work without losing the alpha channel?