The puzzle is self-contained in the image below. The answer is a three-words sentence.

Here is a transcript of the image: for each cell the UPPERCASE letter represents the background color, the lowercase letter is the content of the cell. UPPERCASE letters meaning: B(blue) G(green) K(black) O(orange) R(red) T(turquoise) Y(yellow) V(violet) W(white)

code: T R K B V

Yp Yj Gx Rl Rj Tw Wx Vg Tc Re Kl Vg Wy Vc Bx Oa
Rb Yx Gs Kx Ww Rr Oy Gz Bt Te Vx Vu Kz Vi Ba Rx
Tl Tl Os Kt Ow Gl Yx Gt Te Bx Br Ga Wc Ve Rx Tx
Vn Bo Yl Yf Ro Ym Wd Rs Kx Bd Gm Op Yx Yu Bm Vo
Gx Oa Vi Tn Rx Ke Tw We Re Wz Vt Ow Vw Bx Tb Gi
Gm Tf Vn To Rx Vw Ga Yx Vs Ym Wc Kx Rr Gb Tx Bw
Tu Kv Rk Th Tb Rt Ks Vx Tr Wz Gm By Bw Kt Wo Vm
Yx Ym Rx Bo Ke Oo Bv Gs Yx Bx Oc Kt Ta Gw Vx Ov
Bx Oy Te We Kn Wu Yd Vi Tl Ge Bo Vm Gn Tm Rx On
Ob Tz Rn Bk Gf Va Bn Yx Wn Tt Te Bj Yd Kx Ri Br
By Gv Rs Be Gg Wk Ta We Gy Wq Be Vx Ye Gi Va Yd
Ts Bn Vp Go Yw Rx Rx Yg Tr Yj Tz Wq Wy Kx Or Be
Yt Rf Vt Th Gt Vi Od Re Tn Bx Kc Wo Vh Gr Bo Vd
Km Re Rd Os Ri Re Te Tf Bj Wb Rx Rh Vt Yx Wq Bi
Yu Vj Rn Ge Bc Ky Vo Rn Yt Kl Vl Rm Vj Ke Vx Ra
Ry Vi Gr Bh Od Oc Ge Vy Yx Vo Of Gc On Bo Wx Kt
Yh Vd Tl Kp Va Re Ga Ov Vz Tq Oc Tp Rw Bi Oj Gr
Rs Tu Rf Yd Th Kd Bp Yu Tm Os Yh Wm Oo Tr Vu Rp
Ou Vq Kv Gv Tx Ok Tx Wn Od Wa Tw Kg Ot Yx Vo Vj
Bk Vi Wg Rv Wy Wd Ok Rr Rj Rs Vp Vi Kr Bz Ov Kx
Wc Rm Ow Ry Vc Vf Bx Vc Wu Ge Oz Gp Ks Rf Gu Rf
Gq Rr Gs Kf Gy Gh Kr Kk Wg Va Bb Yo Ya Kf Ok Ol
Bi Km Rb Tx Yy Tt Tg Ot Vy Vs Wt Ve Bo Rk Yw Re
Vv Yq Rr Vq Wv Rf Gr Or Rg Gb Oq Kp Kf Op Gz Yk
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