How to convert RGBA4444 TGA files to RGBA8888 ?

[pierro787]

Hi,

I have several thousands of tga files (without palette) wich contain RGBA4444 data (I know usualy tga files don't contain RGBA4444 datas). I would like to convert them into RGBA8888 data. I use the following command line

convert -depth 4 woody4.tga -depth 8 woddy8.tga

In this case, woody4.tga is the original rgba4444 file, and woody8 the target rgba8888 file but it doesn't change the colors of my pictures, what am I missing ?

Thanks,

Pierre

[snibgo]

Are you saying your image files are not in a standard TGA format? Then I doubt IM can successfully read them.

Perhaps some kind of mangling with IM at the command line is possible. Are the pixels compressed? If not, the simplest method may be a simple program (or bash script) that reads the bytes and expand them to IM's "RGB:" format.

[pierro787]

Yes the data are not in a standard TGA format. Here are some of them:

http://www.maison-sartrouville.fr/voisin/

The pictures are from the game "Neigbours from hell". Some people wrote successfully a program to convert them with DarkBasic Pro from RGBA 4444 to RGBA 8888 but I'm asking if Imagemagick can not do the job successfully.

Thanks for your help,

Pierre

[pierro787]

The pixels are not compressed, there are simply 16 bits depth, no palette, nothing special except there are into the RGBA 4444 format.

[fmw42]

Need they be converted to TGA or any 8-bit per channel depth format?

What is your IM version and platform/OS? Please always provide that.

[pierro787]

any 8-bit per channel depth format wil be ok, BMP for example is OK

Thanks,

[pierro787]

My version is: ImageMagick 7.0.5-1 Q16 x64 2017-03-04 (Windows 10 64 bits)

[fmw42]

Does this do what you want?

Code: Select all

magick identify -verbose N_birthday_0000.tga

Channel depth:
red: 5-bit
green: 5-bit
blue: 5-bit
alpha: 1-bit

Code: Select all

magick N_birthday_0000.tga -depth 8 result.tga

Code: Select all

magick identify -verbose result.tga

Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
alpha: 1-bit

[snibgo]

@pierro787: can you link to an example (eg .PNG) of what one of those images should look like? IM can read those TGA files, but I suppose it is misreading them, thinking they have 5 bits/channel/pixel when they really have only 4.