Try adding the ColorSpace -> "RGB" option to Image[]. The alpha channel still seems to be present even though it's called RGB.

There is also SetAlphaChannel[], in case that is helpful to you.

THANK YOU SO MUCH MICHAEL ROGERS IT WORKED THE DOG IS BROWN AS IT SHOULD BE!!!!

(* Abrir uma caixa de entrada para colocar o caminho da foto *)
caminhoWeb = InputString["Digite o URL da foto:"];

(* Importar a foto da web *)
img = Import[caminhoWeb];

(* Verifique se a imagem foi importada corretamente *)
If[Head[img] === Image,
  (* Obter os dados da imagem em formato RGB *)
  imgData = ImageData[img];

  (* Adicionar o canal alfa de 255 a cada pixel *)
  rgbaData = Map[Append[#, 255/255.] &, imgData, {2}];

  (* Transformar de volta em imagem RGBA *)
  imgRGBA = Image[rgbaData, "Real"];

  imgRGBA,

 ![enter image description here][1]
img=imgRGBA now using this code the image as it appears to me is like this ![the real picture is brown and white][2]

the other image i am trying to post here is brwon and white , it happeans everytime it downloads into the program....it in not in RGB...this is the path to it" https://img.freepik.com/fotos-gratis/cachorrinho-fofo-sentado-olhando-para-a-camera-brincalhao-e-divertido-gerado-pela-inteligencia-artificial_25030-64686.jpg?ga=GA1.1.1193913009.1730565348&semt=ais_hybrid" I wonder if anybody can contour this problem... or i am gonna have to wait for wolfram to include RGBA in the packet...

{74,75,67,74,75,67,74,75,67,74,75,67,74,75,67,74,75,67,74,75,67,74,75,67,74,75,67,74,75,67,74,75,67,74,75,67,74,75,67,74,75,67,74,75,67,74,75,67,76,77,69,76,77,69,76,77,69,76,77,69,76,77,69,76,77,69,76,77, \[CenterEllipsis]151739\[CenterEllipsis] ,0,1,2,0,1,2,0,1,2,0,1,2,0,1,2,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,3,3,3,3,3,3,3,3,3,2,2,2,2,2,2,1,1,1,1,1,1,1,1,1,0,0,0}

every time the file is saved in the desktop it appears with this ending and it does not work while when i copy from the web it has this ending :

{74,75,67,255,74,75,67,255,74,75,67,255,74,75,67,255,74,75,67,255,74,75,67,255,74,75,67,255,74,75,67,255,74,75,67,255,74,75,67,255,74,75,67,255,74,75,67,255,74,75,67,255,74,75,67,255,74,75,67, \[CenterEllipsis]202382\[CenterEllipsis] ,1,1,255,1,1,1,255,1,1,1,255,1,1,1,255,1,1,1,255,1,1,1,255,3,3,3,255,3,3,3,255,3,3,3,255,2,2,2,255,2,2,2,255,1,1,1,255,1,1,1,255,1,1,1,255,0,0,0,255}

and it works fine

in graphics at the top of the mathematica program they are all disabled...

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