You may have trouble uploading an image due to image format or size. Yahoo! Store supports most standard image formats, including GIF, TIFF, PICT, PCX, JPG (JPEG), and progressive JPG.
If, after uploading an image, you see an error message icon on the page (a broken image in Netscape or a red-x image in Internet Explorer), or a small empty box or red square, then you have probably attempted to upload an image format that is not yet supported. It is also possible that you've uploaded a file that is corrupted (damaged in some way). One solution is to use image software (such as PhotoShop or Paint Shop Pro) to convert and save your image in one of the formats supported by Yahoo! Store.
If your image format isn't causing an upload problem, then your difficulty may be due to image size. Yahoo! Store is equipped to handle uploads of up to 16MB. However, even with a high-speed Internet connection, uploading a file this size might take half an hour. With a dial-up connection, uploading an image of only 2MB could take half an hour. In general, it is preferable to use smaller-sized, lower resolution images in your store. These download quickly and don't cause long delays for customers attempting to view your product pages.
We recommend 100KB as a good maximum size for a single image.
If you've re-uploaded an image saved in the JPEG (.jpg) or GIF (.gif) format to your Yahoo! Store and you're still seeing a red-square image, it is possible that the image you've uploaded is not properly encoded.
To resolve this, load the image into an image editing program that can re-save your image in a properly encoded format (such as .jpg or .gif). This ensures that the encoding conforms exactly to the standard set for that format.
If you've already re-saved your images using a specific image editing program and you're still getting the red square when you re-upload that image, you may need to use a different image processing program that does not lose data or include invalid information when encoding the image.
If you're using Adobe ImageReady or Adobe PhotoShop, be sure to save the "optimized" image (rather than the original) as a GIF (.gif) or JPEG (.jpg) file before you upload it to your store.