The process for saving in NW4C_Tga (NW4C_ctex) format differs depending on whether an ETC filter has been applied.
This document describes this difference.
When an ETC filter has been applied
When an ETC filter has not been applied
When saving an NW4C_Tga (NW4R_ctex)
format image that has not been modified since an ETC filter was applied, data reflecting application of the filter is output to TGA file additional information or a CTEX file. (Double compression status does not result.)
If an ETC filter has been applied and then data is saved, the Photoshop image quality cannot be changed back to the state before the filter was applied. When applying filtering, be careful not to save the resulting data in the same file used prior to filtering. |
If an image is modified after applying the ETC filter, the image is handled as if the filter was not applied.
When saving an NW4C_Tga (NW4C_ctex)
format image and no ETC filter has been applied, data for compressed images is output to TGA file additional information or a CTEX file.
When using NW4C_Tga
, the image quality in Photoshop is always the same as prior to compression and the image quality will not be degraded when the data is saved.
CONFIDENTIAL