sai format is designed to detect data breakdown strictly, but some of other formats don't care the little broken data, so in this case not only. In current version's solution to avoid these problem is separate these (reading failed) JPEG files from the file viewer's displaying folder.
We recognize this is bug so we will fix it in next release of SAI. In Ver.1.1.0, if the Exif resolution embedded in JPEG file is 0/0 this cause division by zero error(EXCEPTION_INT_DIVIDE_BY_ZERO), this problem occur when the file viewer creating thumbnails. In current version's solution to avoid these problem is separate these (reading failed) PNG files from the file viewer's displaying folder. In Ver.1.1.0, if the PNG reading is failed this cause access violation error(EXCEPTION_ACCESS_VIOLATION), this problem occur when the file viewer creating thumbnails. We are considering to provide more information for this error message in next release of SAI. If broken SAI file is read, the error message 'Opening canvas failed' will be shown, this is almostly cause machine trouble of HDD etc.
If too large picture to allocate enough memory is read, the error message 'Opening canvas failed' will be shown. (*2 This value is reported by Windows, and actual maximum value looks 99% and not 100%. (*1 The operating system described here is for PC like systems, and not include for embedded system like phone. Physical memory 256MB, memory use 500MB, memory load 70%, looks comfortable, but when exchange foreground applications much swapping will occur. Physical memory 256MB, memory use 756MB, memory load 100%(*2), almostly not move, and system looks to work only for swapping. Physical memory 256MB, memory use 300MB, memory load 100%(*2), too slow, frequently swapping memories. Physical memory 256MB, memory use 128MB, memory load 50%, comfortable, almost no swapping. Simplified examples for relation between physical memory and memory use and memory load are This memory access on HDD is called 'Memory swap' or 'Page swap' or simply called 'Swap'. By this function, applications can use larger memory than equipped memory on PC, but if application use too large memory than physical (really equipped) memory, operating system need to access HDD more frequently and application speed become slower. Usually operating system(*1) has function named virtual memory, in very simplified explanation, virtual memory function locate the memory on HDD that applications using, and physical memory is used as cache.
This means how much physical memory is used by programs on PC, this value is affected by SAI and all other programs running on Windows now.
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