Image Handler 2 (for ZC v1.3.8 ONLY) Support

[kuroi]

I am worried that IH2 might mess up quite a lot of my other product images.

This is nothing to do with Image Handler. It's how the underlying Zen Cart code recognises an additional image.

I name a lot of my product images according to brands or styles. So if I have 3 different types of CK T shirts. All of the images will start with ck-tee-, for example:

For 1st product titled as CK Tee V Neck, I have these pictures.
ck-tee-v-neck.jpg (original)
ck-tee-v-neck-2.jpg (uploaded and displayed in description)
ck-tee-v-neck-3.jpg (uploaded and displayed in description)
So according to your explanation, the uploaded ck-tee-v-neck-2.jpg and ck-tee-v-neck-3.jpg will become additional images of the original ck-tee-v-neck.jpg. But I checked some products, this does not seem true.

Provided you have entered ck-tee-v-neck.jpg as the image for the product, and have not changed the additional_images module in Zen Cart, this is how it works, except that it doesn't link the images together. What happens is that when the product info page is called, the additional images module then trawls your images folder for any images that start in the same way as the product image and calls the additional images template to display them. Do you have actual examples where this doesn't appear to be working?

For some products, say 2nd product titled as CK Tee Long Sleeve, I have these pictures.
ck-tee-long-sleeve-3.jpg (original)
ck-tee-long-sleeve-2.jpg (uploaded and displayed in description)
ck-tee-long-sleeve.jpg (uploaded and displayed in description)
Will the uploaded ck-tee-long-sleeve-2.jpg and ck-tee-long-sleeve.jpg become additional images of ck-tee-long-sleeve-3.jpg?

I'm not sure what yuou mean by uploaded and displayed in description. Do you mean that you have embedded them in the product description? In any case, if ck-tee-long-sleeve-3.jpg has been entered as the product's image then ck-tee-long-sleeve-2.jpg and ck-tee-long-sleeve.jpg will be ignored as additional images as their base names ck-tee-long-sleeve-2 and ck-tee-long-sleeve and not extensions of ck-tee-long-sleeve-3.