Convert ktx2 to png/jpg

[nguyen-lc]

Do you guys know how to convert ktx2 to png/jpg. Thanks

[MarkCallow]

png and jpg files are not equivalent to ktx2 files. Each can only contain a single image while ktx2 files can have many images. Therefore you cannot convert them. You can extract one or more images from a ktx2 file, writing each it to a png file using the ktx extract command in the 4.3-alpha1 release.

[MarkCallow]

ktx info will tell you the size of the base level and the number of levels. From that the sizes of other levels are easily calculated. What levels, etc were extracted depends on the command options you used and the input file. Do you have multiple output .png files or just one? If multiple, which file are you looking at?

[nguyen-lc]

My ktx2 file using 10 level. I'm just wanna get the first level with one png/jpg image.
vkFormat: VK_FORMAT_UNDEFINED
typeSize: 1
pixelWidth: 512
pixelHeight: 512
pixelDepth: 0
layerCount: 0
faceCount: 1
levelCount: 10
supercompressionScheme: KTX_SS_BASIS_LZ
dataFormatDescriptor.byteOffset: 0x140
dataFormatDescriptor.byteLength: 44
keyValueData.byteOffset: 0x16c
keyValueData.byteLength: 120
supercompressionGlobalData.byteOffset: 0x1e8
supercompressionGlobalData.byteLength: 10961
This is some info of it

[MarkCallow]

If the output file is less than 512x512 one of the following is true:

• You are not looking at the image extracted from level0.
• There is a bug in ktx extract.

What was the full ktx extract command that you used?

The images in the source ktx are compressed with ETC1S/Basis-LZ. Whatever artifacts are in the source image will be visible in the exported file. To reduce those artifacts you will need to re-encode the original image with different settings.

The tool does not export to jpg as jpg would most likely add further artifacts to the image.

[nguyen-lc]

i'm using ktx extract file.ktx2 ./file.jpg

[MarkCallow]

i'm using ktx extract file.ktx2 ./file.jpg

Regardless of the file name, a png file will be output and it will be in a file called ./file.jpg.png. Is the output file 512x512? Try ktx extract --level 0 ./file.png and see if the resulting image is any different.