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Try to keep integer precision by briefly casting to double while decoding and encoding.

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This commit is contained in:
Jorge Rodriguez
2014-07-30 01:18:23 -07:00
parent 11897fbf96
commit 6625259959
2 changed files with 8 additions and 8 deletions
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8
tests/resample_test.cpp
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@ -128,9 +128,9 @@ void resize_image(const char* filename, float width_percent, float height_percen
template <typename F, typename T>
void convert_image(const F* input, T* output, int length)
{
float f = (pow(2.0f, 8.0f * sizeof(T)) - 1) / (pow(2.0f, 8.0f * sizeof(F)) - 1);
double f = (pow(2.0, 8.0 * sizeof(T)) - 1) / (pow(2.0, 8.0 * sizeof(F)) - 1);
for (int i = 0; i < length; i++)
output[i] = (T)(((float)input[i]) * f);
output[i] = (T)(((double)input[i]) * f);
}
template <typename T>
@ -155,8 +155,8 @@ void test_format(const char* file, float width_percent, float height_percent, st
free(T_data);
stbi_image_free(input_data);
char* char_data = (char*)malloc(new_w * new_h * n * sizeof(char));
convert_image<T, char>(output_data, char_data, new_w * new_h * n);
unsigned char* char_data = (unsigned char*)malloc(new_w * new_h * n * sizeof(char));
convert_image<T, unsigned char>(output_data, char_data, new_w * new_h * n);
char output[200];
sprintf(output, "test-output/type-%d-%d-%d-%d-%s", type, colorspace, new_w, new_h, file);