Only reconstruct on debug

src/descriptors/dct.rs

@@ -1,7 +1,7 @@
 use image::{save_buffer, GenericImageView};
 use std::f64::consts::{PI, SQRT_2};
 use crate::descriptors::{Descriptor, DCT, print_matrix};
-use log::debug;
+use log::{debug, log_enabled, Level};
 
 
 impl DCT {
@@ -114,6 +114,7 @@ impl Descriptor for DCT {
         }
         debug!("DCT-coefficients, quantized:\n {}", print_matrix(dct_values));
 
+        if log_enabled!(Level::Debug) {
             // De-quantization:
             for i in 0..64 {
                 dct_values[i] = dct_values[i] * self.quantization_matrix[i] as f64;
@@ -131,6 +132,7 @@ impl Descriptor for DCT {
                 8,
                 image::ColorType::L8
             ).expect("Error saving buffer");
+        }
 
         // Calculating descriptor from dct values:
         let mut mask: u64 = 0;