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A minor change to avoid a compiler warning.
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@ -261,9 +261,9 @@ namespace dlib
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assign_pixel(background_color, 0);
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temp = background_color;
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unsigned long idx = 0;
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for (long r = 0; r < size_nr; ++r)
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for (unsigned long r = 0; r < size_nr; ++r)
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{
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for (long c = 0; c < size_nc; ++c)
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for (unsigned long c = 0; c < size_nc; ++c)
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{
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if (idx < images.size())
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{
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