1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 4<meta http-equiv="Content-Style-Type" content="text/css"> 5<link rel="stylesheet" href="css/manpage.css" type="text/css"> 6<title>Mipmap Creation Plug-in</title> 7</head> 8<body> 9 10<h2><a name="create_mip">Mipmap Creation Plug-in</a></h2> 11<p>This plug-in is used to create 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 and NW4C_Tga (NW4C_ctex) format is used to save the data, the mipmap data is exported.</p> 12 13<h3><a name="create_mip_create">Creating Mipmap Images</a></h3> 14<p>Prepare an image for the base image. The image width and height must be a power of 2 and have a size equal to or greater than 16.<br> Select a visible layer if a hidden layer is selected. <br> A dialog box will appear if you execute [Automatic Processing] -> [NW4C_CreateMipMap] on the [File] menu.</p> 15<p><img src="images/CreateMipMapOpt1.gif" border="0"></p> 16<p>Enter the number of mipmap levels. At this time, count the base 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). <br> If <strong>All</strong> is selected, create images up to the maximum number of levels for the given size of the base image.<br> If <strong>All(ETC1)</strong> is selected, 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) .<br> Click [OK] to create the mipmap image.<br> The image for each level represents a different layer arranged as shown in the following figures.</p> 17<p><a name="mipmap_image">[MIP Map Image (Level Number: 3）】</a><br> <img src="images/CreateMipMapResult1.gif" border="0"></p> 18<p>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. <br> If a layer is unneeded, the image can be integrated.</p> 19 20<h3><a name="create_mip_restore">Restoring Mipmap Layers</a></h3> 21<p>After the mipmap creation plug-in is executed, all layers are integrated if data is saved and reloaded in NW4C_Tga (NW4C_ctex) format. Under this condition, layers can be restored for each level by executing the mipmap creation plug-in.<BR> Even if an image has not been created using the mipmap creation plug-in, <strong>Use MipMap</strong> can be selected when saving in NW4C_Tga (NW4C_ctex) format by executing the mipmap creation plug-in as long as the mipmap images, each having half the width and height of the next, have been arranged horizontally with their top edges aligned.</p> 22 23<h3><a name="create_mip_change_levels">Changing the Number of Mipmap Levels</a></h3> 24<p>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 with three levels has been created for a 32x32 image. To change the number of levels to 2, set the height to 48 (= 32 + 16) using [Canvas Size] on the [Image] menu. (This sets the top as the anchor.) The number of levels will become 2 when the mipmap creation plug-in is executed.</p> 25 26<h3><a name="create_mip_from_v">Conversion from a Vertically Aligned Mipmap Image</a></h3> 27<p>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.)</p> 28 29<h3><a name="create_mip_notes">Notes</a></h3> 30 31<h4><a name="create_mip_image_mode">Image Mode</a></h4> 32<p>Executing only when the image mode is gray scale, index color, and RGB color is possible. <br> If the image mode is index color, the plug-in changes the image mode to RGB color. At this time, a confirmation message appears. Click [OK] to continue or [Cancel] to cancel.<br> Executing on files that use 16 bits per channel is impossible.</p> 33 34<h4><a name="create_mip_alpha_chan">Alpha Channel</a></h4> 35<p>Executing with more than one alpha channel is impossible.</p> 36 37<h4><a name="create_mip_layer">Layers</a></h4> 38<p>Automatically integrate images to create a compressed image when there is more than one visible layer.</p> 39 40<h4><a name="create_mip_interp">Image Interpolation Methods</a></h4> 41<p>Selecting an interpolation method from [Environment settings] -> [General] on the Photoshop [Edit] menu determines the interpolation method to use to reduce an image.</p> 42 43<h4><a name="create_mip_save_load">Save and Load</a></h4> 44<p>After the mipmap creation plug-in is executed, all layers are integrated if data is saved and reloaded in NW4C_Tga (NW4C_ctex) format. After loading, layers can be restored for each level by executing the mipmap creation plug-in.<BR> Furthermore, the contents of the margins formed to the lower right of the image are not saved in NW4C_Tga (NW4C_ctex) format.</p> 45 46<h4><a name="create_mip_filter">Using with a Filter Plug-in</a></h4> 47<p>Execute a color depth or ETC filter after the mipmap creation plug-in has been executed and the image has been integrated. <br> A warning dialog box is displayed if you attempt to execute the mipmap creation plug-in on the image to which a color depth filter or ETC filter was already applied.</p> 48 49<p><br><br></p> 50<hr><p>CONFIDENTIAL</p></body> 51</html>
