This plug-in creates mipmap images (vertically arranged images where the width and height of the images have been compressed to 1/2, 1/4, ...) using Photoshop. Each image created for each level becomes a separate layer. If the mipmap creation plug-in is executed first and NW4C_Tga (NW4C_ctex) format is used to save the data, the mipmap data is exported.
Prepare an image for the principal (top level) image. The image width and height must be a power of 2 and have a size equal to or greater than 16.
Select a visible layer if a hidden layer is selected.
Select File > Automate > NW4C_CreateMipMap to display a dialog box.
Enter the number of mipmap levels. At this time, count the principal image as 1 level. The minimum number of levels is 2 and the maximum number of levels depends on the size of the original base image (maximum 8).
Select All to create images up to the maximum number of levels for the given size of the base image.
Select All(ETC1) to create images up to the maximum number of levels when using ETC1 compression for the given size of the base image (the maximum number is 7) .
Click OK to create the mipmap image.
The image for each level becomes a separate layer arranged as shown in the following figures.
[Mipmap Image (Level Number: 3)]
To change the image pattern after creating the mipmap image, edit the data of each layer. However, layers must not be moved and image sizes must not be changed.
If a layer is unnecessary, the images can be merged.
If data is saved and reloaded in in NW4C_Tga (NW4C_ctex) format after the mipmap creation plug-in is executed, all layers are flattened. Under this condition, layers can be restored for each level by executing the mipmap creation plug-in.
Even if an image has not been created using the mipmap creation plug-in, Use MipMap can be selected as follows. When saving data in NW4C_Tga (NW4C_ctex) format, you can execute the mipmap creation plug-in if the image has half the width and height of the original and both images have been arranged horizontally with their top edges aligned.
The number of mipmap levels can be changed by changing the width of the mipmap image and then executing the mipmap creation plug-in. For example, assume that a mipmap image with three levels has been created for a 32x32 original image. To change the number of levels to 2, select Image > Canvas Size to set the width to 48 (= 32 + 16) (This sets the top as the anchor and leaves the left side of the image as the basis.) The number of levels becomes 2 when the mipmap creation plug-in is executed.
A vertically aligned mipmap image can be converted to a horizontally aligned mipmap image by executing the mipmap creation plug-in on the vertically aligned image. (With a vertically aligned mipmap, each consecutive image has half the width and height of the previous image and images are arranged vertically with their left edges aligned.)
Image mode can be executed only when the image mode is grayscale, index color, or RGB color.
If the image mode is index color, the plug-in changes the image mode to RGB color. A confirmation message is displayed when this is the case. Click OK to continue or Cancel to cancel.
Execution on files that use 16 bits per channel is impossible.
Executing with more than one alpha channel is impossible.
Automatically merge images to create a compressed image when there are multiple visible layers.
To reduce an image, use an image interpolation method displayed via Photoshop (Edit > Preferences > General).
If data is saved and reloaded in NW4C_Tga (NW4C_ctex) format after the mipmap creation plug-in is executed, all layers are flattened. After loading, layers can be restored for each level by executing the mipmap creation plug-in.
Furthermore, the contents of the margins created to the lower right of the image are not saved in NW4C_Tga (NW4C_ctex) format.
Execute a color depth or ETC filter after the mipmap creation plug-in has been executed and all layers have been flattened.
A warning dialog box is displayed if you attempt to execute the mipmap creation plug-in on an image to which a color depth filter or ETC filter was already applied.
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