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Introduction:
Learn how to convert batch graphics for use in Rm2k/2k3, Game Maker (Old Version), MMFusion (Old Version) and other engines that use 8-Bit graphics.
An example is the images in this topic, originally the size of 378 Kb (24/32 bits), now the size of 120 Kb (8 bits).
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Tutorial:
Downloading
FastStone PhotoResizer.
Alert: If you are not the administrator of your machine download the portable version.
Click to expand...
Browse or drag all images into the software.

FS-PR1.png
Now select in "Output Format" the PNG option:

FS-PR2.png
Click on "Settings", a window will appear, just change the "Colors" field to 256.

FS-PR3.png
Turn on the "Output Folder" option and set a folder to store the converted graphics.
Do not do this in the same folder, you may damage the original graphics.
Alert:
If you are running Windows Vista (or higher) and need to use MSPaint to do any editing, the image will be converted 24 or 32-bit again..
Click to expand...
The required settings have already been applied:

FS-PR4.png
Now to convert just hit the "Convert" button and wait for the progress.
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Checking the result:
Go to the output folder, right click on any image and select "Properties":

FS-PR5.png
Click on "Details", the Bit Intensity line should be number 8.
If it's 24 or 32, that's why you made a mistake converting.

FS-PR6.png
EXTRA:
Keeping the tree structure of folders:
Browse the software to the project folder, select "CTRL" only the folders with graphics.
Now press the
Add button:

FS-PR7.png
After conversion, in the output folder you will find a copy of all graphic folders:

FS-PR8.png
本贴来自国际rpgmaker官方论坛作者:Thanatos处,因国际论坛即将永久关站,为了存档多年珍贵资料,署名转载到本论坛存档,由于官方帖子为英文原帖,需要中文翻译请点击论坛顶部切换语言为中文就可以将帖子翻译成中文浏览,方便大家随时查看,原文地址:
https://forums.rpgmakerweb.com/threads/batch-method-converting-multiple-images-to-8-bit-png.113948/