下载的文件模糊Unity3D

Question

我有一个简单的代码，从url下载文件并保存到android内部数据存储这里是我的代码

static doc_small_t doc_small_instances[NUM_SMALL_INSTANCES];
static doc_large_t doc_large_instances[NUM_LARGE_INSTANCES];

// DocInit must be called once at startup to initialize all the instances.
void DocInit()
{
    int index;

    for (index = 0; index < NUM_SMALL_INSTANCES; index++)
    {
        doc_small_instances[index].base.doc_type = SMALL;
        doc_small_instances[index].base.array_ptr = doc_small_instances[index].array;
    }

    for (index = 0; index < NUM_LARGE_INSTANCES; index++)
    {
        doc_large_instances[index].base.doc_type = LARGE;
        doc_large_instances[index].base.array_ptr = doc_large_instances[index].array;
    }
}

// DocProcess processes one doc, large or small.
void DocProcess(doc_base_t *document)
{
    int index;
    short *array_member_ptr = document->array_ptr;

    int array_size = SMALL;
    if (document->doc_type == LARGE)
    {
        array_size = LARGE;
    }

    for (index = 0; index < array_size; index++)
    {
        // Application specific processing of *array_member_ptr goes here.

        array_member_ptr++;
    }
}

// ProcessAllDocs processes all large and small docs.
void ProcessAllDocs(void)
{
    int index;

    for (index = 0; index < NUM_SMALL_INSTANCES; index++)
    {
        DocProcess(&doc_small_instances[index].base);
    }

    for (index = 0; index < NUM_LARGE_INSTANCES; index++)
    {
        DocProcess(&doc_large_instances[index].base);
    }
}    

图片已成功下载并完美显示在设备上

但是在本地存储/ android /data/com.xxx.xxx/abc.png这个文件看起来好像它的颜色一直受到干扰。

应该是什么解决方案