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Sizes and Format
They generally are TGA format to increase clarity - although DDS can of course be used.
They can be increased in size past the default sizes Bioware originally intended but this comes at the cost of them not loading in the toolset properly. NWN properly downsizes the texture so it still looks fine at lower resolutions/no "2x GUI size increase".
Icons of course have transparency - especially in the inventory - which is where there is an absence of pixels in the TGA/DDS file.
The main thing if changing the size is the ratio should stay the same else stretching would presumably occur - or possibly the texture won't load - so doubling the size is easiest for a HD upgrade.
| Icon Type | Example Usage and icon prefix | Default Game Resolution | Double Resolution Size |
|---|---|---|---|
| 1x1 Inventory | GUI icons (used in action bar/radial/quickbar) - ir Spell scrolls - iss Spell icons (used in levelup/spellbook/radial/quickbar) - is Feat icons (used in levelup/radial/quickbar) - ife Skill icons (used in levelup/radial/quickbar) - isk Domain icons (used in char sheet/leveup) - id Effect icons (used in char sheet/sometimes top right) - ief Inventory 1x1 icons (eg; Gems) - i (but usually itt) DM action icons (DM mode) - dm_ | 32x32 | 64x64 |
| 1x2 Inventory | Inventory icons - bracers etc. - i (but usually itt) | 32x64 | 64x128 |
| 1x3 Inventory | Inventory icons - torches etc. - i (but usually itt) Note the bottom 32 pixels are not used by the game | 32x128 | 64x256 |
| 2x1 Inventory | Inventory icons - Small weapons, arrows, etc. - i (but usually itt) | 64x32 | 128x64 |
| 2x2 Inventory | Inventory icons - boxes, traps etc. - i (but usually itt) | 64x64 | 128x128 |
| 2x3 Inventory | Inventory icons - cloaks, armor etc. - i (but usually itt) Note the bottom 32 pixels are not used by the game | 64x128 | 128x256 |